11979657 has 14 divisors (see below), whose sum is σ = 17962362. Its totient is φ = 7985952.

The previous prime is 11979647. The next prime is 11979659. The reversal of 11979657 is 75697911.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 35721 = 3456^2 + 189^2 .

It is not a de Polignac number, because 11979657 - 2⁶ = 11979593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11979659) 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 13 ways as a sum of consecutive naturals, for example, 7488 + ... + 8945.

Almost surely, 2^11979657 is an apocalyptic number.

It is an amenable number.

11979657 is a deficient number, since it is larger than the sum of its proper divisors (5982705).

11979657 is an frugal number, since it uses more digits than its factorization.

11979657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16451 (or 16436 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 11979657 is about 3461.1641105270. The cubic root of 11979657 is about 228.8134035479.

The spelling of 11979657 in words is "eleven million, nine hundred seventy-nine thousand, six hundred fifty-seven".