11656401 has 8 divisors (see below), whose sum is σ = 15654240. Its totient is φ = 7714752.

The previous prime is 11656399. The next prime is 11656451. The reversal of 11656401 is 10465611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11656401 - 2¹ = 11656399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11656451) 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 7 ways as a sum of consecutive naturals, for example, 13560 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (1956780).

Almost surely, 2^11656401 is an apocalyptic number.

It is an amenable number.

11656401 is a deficient number, since it is larger than the sum of its proper divisors (3997839).

11656401 is a wasteful number, since it uses less digits than its factorization.

11656401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28095.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 11656401 is about 3414.1471848765. The cubic root of 11656401 is about 226.7365285903.

The spelling of 11656401 in words is "eleven million, six hundred fifty-six thousand, four hundred one".