1979635920 has 40 divisors (see below), whose sum is σ = 6136872096. Its totient is φ = 527902848.

The previous prime is 1979635891. The next prime is 1979635927. The reversal of 1979635920 is 295369791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×1979635920⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979635927) 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 7 ways as a sum of consecutive naturals, for example, 4124002 + ... + 4124481.

Almost surely, 2^1979635920 is an apocalyptic number.

1979635920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979635920 is an abundant number, since it is smaller than the sum of its proper divisors (4157236176).

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

1979635920 is a wasteful number, since it uses less digits than its factorization.

1979635920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8248499 (or 8248493 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 51.

The square root of 1979635920 is about 44493.0996897272. The cubic root of 1979635920 is about 1255.6302649511.

The spelling of 1979635920 in words is "one billion, nine hundred seventy-nine million, six hundred thirty-five thousand, nine hundred twenty".