1213432656 has 20 divisors (see below), whose sum is σ = 3134701152. Its totient is φ = 404477536.

The previous prime is 1213432639. The next prime is 1213432657. The reversal of 1213432656 is 6562343121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213432657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12639876 + ... + 12639971.

Almost surely, 2^1213432656 is an apocalyptic number.

1213432656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213432656 is an abundant number, since it is smaller than the sum of its proper divisors (1921268496).

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

1213432656 is a wasteful number, since it uses less digits than its factorization.

1213432656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25279858 (or 25279852 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 1213432656 is about 34834.3602783229. The cubic root of 1213432656 is about 1066.6089564264.

Adding to 1213432656 its reverse (6562343121), we get a palindrome (7775775777).

The spelling of 1213432656 in words is "one billion, two hundred thirteen million, four hundred thirty-two thousand, six hundred fifty-six".