12156907 has 4 divisors (see below), whose sum is σ = 13893616. Its totient is φ = 10420200.

The previous prime is 12156899. The next prime is 12156983. The reversal of 12156907 is 70965121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70965121 = 5717 ⋅12413.

It is not a de Polignac number, because 12156907 - 2³ = 12156899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12156107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868344 + ... + 868357.

It is an arithmetic number, because the mean of its divisors is an integer number (3473404).

Almost surely, 2^12156907 is an apocalyptic number.

12156907 is a deficient number, since it is larger than the sum of its proper divisors (1736709).

12156907 is an equidigital number, since it uses as much as digits as its factorization.

12156907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736708.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 12156907 is about 3486.6756373371. The cubic root of 12156907 is about 229.9363844226.

The spelling of 12156907 in words is "twelve million, one hundred fifty-six thousand, nine hundred seven".