1979136140 has 24 divisors (see below), whose sum is σ = 4374933360. Its totient is φ = 749988288.

The previous prime is 1979136139. The next prime is 1979136143. The reversal of 1979136140 is 416319791.

It is not an unprimeable number, because it can be changed into a prime (1979136143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2603747 + ... + 2604506.

It is an arithmetic number, because the mean of its divisors is an integer number (182288890).

Almost surely, 2^1979136140 is an apocalyptic number.

1979136140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979136140 is an abundant number, since it is smaller than the sum of its proper divisors (2395797220).

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

1979136140 is a wasteful number, since it uses less digits than its factorization.

1979136140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208281 (or 5208279 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1979136140 is about 44487.4829586930. The cubic root of 1979136140 is about 1255.5245903496.

The spelling of 1979136140 in words is "one billion, nine hundred seventy-nine million, one hundred thirty-six thousand, one hundred forty".