25643401 has 4 divisors (see below), whose sum is σ = 29306752. Its totient is φ = 21980052.

The previous prime is 25643389. The next prime is 25643419. The reversal of 25643401 is 10434652.

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.

It is a cyclic number.

It is not a de Polignac number, because 25643401 - 2¹⁵ = 25610633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25643441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831665 + ... + 1831678.

It is an arithmetic number, because the mean of its divisors is an integer number (7326688).

Almost surely, 2^25643401 is an apocalyptic number.

It is an amenable number.

25643401 is a deficient number, since it is larger than the sum of its proper divisors (3663351).

25643401 is an equidigital number, since it uses as much as digits as its factorization.

25643401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663350.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 25643401 is about 5063.9313778921. The cubic root of 25643401 is about 294.8889786195. Note that the first 3 decimals are identical.

The spelling of 25643401 in words is "twenty-five million, six hundred forty-three thousand, four hundred one".