1296639936 has 42 divisors (see below), whose sum is σ = 3716585912. Its totient is φ = 432213120.

The previous prime is 1296639923. The next prime is 1296639941. The reversal of 1296639936 is 6399366921.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124980 + ... + 1126131.

Almost surely, 2^1296639936 is an apocalyptic number.

1296639936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1296639936 is an abundant number, since it is smaller than the sum of its proper divisors (2419945976).

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

1296639936 is a wasteful number, since it uses less digits than its factorization.

1296639936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251129 (or 2251116 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 54.

The square root of 1296639936 is about 36008.8869030966. The cubic root of 1296639936 is about 1090.4517769248.

The spelling of 1296639936 in words is "one billion, two hundred ninety-six million, six hundred thirty-nine thousand, nine hundred thirty-six".