12636401 has 4 divisors (see below), whose sum is σ = 12825072. Its totient is φ = 12447732.

The previous prime is 12636397. The next prime is 12636461. The reversal of 12636401 is 10463621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10463621 = 7 ⋅1494803.

It is a cyclic number.

It is not a de Polignac number, because 12636401 - 2² = 12636397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12636461) 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, 94235 + ... + 94368.

It is an arithmetic number, because the mean of its divisors is an integer number (3206268).

Almost surely, 2^12636401 is an apocalyptic number.

It is an amenable number.

12636401 is a deficient number, since it is larger than the sum of its proper divisors (188671).

12636401 is an equidigital number, since it uses as much as digits as its factorization.

12636401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188670.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 12636401 is about 3554.7715819726. The cubic root of 12636401 is about 232.9205461375.

The spelling of 12636401 in words is "twelve million, six hundred thirty-six thousand, four hundred one".