2656401 has 16 divisors (see below), whose sum is σ = 3907008. Its totient is φ = 1592000.

The previous prime is 2656399. The next prime is 2656417. The reversal of 2656401 is 1046562.

It is a cyclic number.

It is not a de Polignac number, because 2656401 - 2¹ = 2656399 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2935 + ... + 3731.

It is an arithmetic number, because the mean of its divisors is an integer number (244188).

2^2656401 is an apocalyptic number.

It is an amenable number.

2656401 is a deficient number, since it is larger than the sum of its proper divisors (1250607).

2656401 is a wasteful number, since it uses less digits than its factorization.

2656401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2656401 is about 1629.8469253277. The cubic root of 2656401 is about 138.4940806465.

It can be divided in two parts, 265 and 6401, that added together give a palindrome (6666).

The spelling of 2656401 in words is "two million, six hundred fifty-six thousand, four hundred one".