1979347440 has 160 divisors (see below), whose sum is σ = 7254535680. Its totient is φ = 436810752.

The previous prime is 1979347393. The next prime is 1979347441. The reversal of 1979347440 is 447439791.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1979347440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979347441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28407 + ... + 69033.

It is an arithmetic number, because the mean of its divisors is an integer number (45340848).

Almost surely, 2^1979347440 is an apocalyptic number.

1979347440 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 1979347440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3627267840).

1979347440 is an abundant number, since it is smaller than the sum of its proper divisors (5275188240).

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

1979347440 is a wasteful number, since it uses less digits than its factorization.

1979347440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40679 (or 40673 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The square root of 1979347440 is about 44489.8577206086. The cubic root of 1979347440 is about 1255.5692702649.

The spelling of 1979347440 in words is "one billion, nine hundred seventy-nine million, three hundred forty-seven thousand, four hundred forty".