1979051940 has 120 divisors (see below), whose sum is σ = 6573648312. Its totient is φ = 496696320.

The previous prime is 1979051933. The next prime is 1979051947. The reversal of 1979051940 is 491509791.

1979051940 is a `hidden beast` number, since 1 + 9 + 7 + 90 + 519 + 40 = 666.

1979051940 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1979051933) and next prime (1979051947).

It can be written as a sum of positive squares in 4 ways, for example, as 19927296 + 1959124644 = 4464^2 + 44262^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1979051947) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8391 + ... + 63470.

Almost surely, 2^1979051940 is an apocalyptic number.

1979051940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979051940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3286824156).

1979051940 is an abundant number, since it is smaller than the sum of its proper divisors (4594596372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1979051940 is a wasteful number, since it uses less digits than its factorization.

1979051940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71899 (or 71888 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 1979051940 is about 44486.5366150254. The cubic root of 1979051940 is about 1255.5067851622.

The spelling of 1979051940 in words is "one billion, nine hundred seventy-nine million, fifty-one thousand, nine hundred forty".