1979991296 has 18 divisors (see below), whose sum is σ = 3952248762. Its totient is φ = 989995520.

The previous prime is 1979991289. The next prime is 1979991301. The reversal of 1979991296 is 6921999791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1873158400 + 106832896 = 43280^2 + 10336^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3866915 + ... + 3867426.

Almost surely, 2^1979991296 is an apocalyptic number.

1979991296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1979991296 is a deficient number, since it is larger than the sum of its proper divisors (1972257466).

1979991296 is an frugal number, since it uses more digits than its factorization.

1979991296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7734357 (or 7734343 counting only the distinct ones).

The product of its digits is 4960116, while the sum is 62.

The square root of 1979991296 is about 44497.0931185398. The cubic root of 1979991296 is about 1255.7053956284.

The spelling of 1979991296 in words is "one billion, nine hundred seventy-nine million, nine hundred ninety-one thousand, two hundred ninety-six".