1312729 has 12 divisors (see below), whose sum is σ = 1521520. Its totient is φ = 1128600.

The previous prime is 1312681. The next prime is 1312733. The reversal of 1312729 is 9272131.

It is not a de Polignac number, because 1312729 - 2⁷ = 1312601 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1312739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2014 + ... + 2584.

2^1312729 is an apocalyptic number.

1312729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1312729 is a deficient number, since it is larger than the sum of its proper divisors (208791).

1312729 is a wasteful number, since it uses less digits than its factorization.

1312729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 601 counting only the distinct ones).

The product of its digits is 756, while the sum is 25.

The square root of 1312729 is about 1145.7438631736. The cubic root of 1312729 is about 109.4943458087.

The spelling of 1312729 in words is "one million, three hundred twelve thousand, seven hundred twenty-nine".