11978957 has 4 divisors (see below), whose sum is σ = 11993436. Its totient is φ = 11964480.

The previous prime is 11978921. The next prime is 11978959. The reversal of 11978957 is 75987911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1552516 + 10426441 = 1246^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 11978957 - 2⁶ = 11978893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978959) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5918 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (2998359).

Almost surely, 2^11978957 is an apocalyptic number.

It is an amenable number.

11978957 is a deficient number, since it is larger than the sum of its proper divisors (14479).

11978957 is an equidigital number, since it uses as much as digits as its factorization.

11978957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14478.

The product of its digits is 158760, while the sum is 47.

The square root of 11978957 is about 3461.0629870027. The cubic root of 11978957 is about 228.8089467564.

The spelling of 11978957 in words is "eleven million, nine hundred seventy-eight thousand, nine hundred fifty-seven".