25426643 has 4 divisors (see below), whose sum is σ = 27738168. Its totient is φ = 23115120.

The previous prime is 25426633. The next prime is 25426651. The reversal of 25426643 is 34662452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25426643 - 2¹⁶ = 25361107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25426633) 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, 1155746 + ... + 1155767.

It is an arithmetic number, because the mean of its divisors is an integer number (6934542).

Almost surely, 2^25426643 is an apocalyptic number.

25426643 is a deficient number, since it is larger than the sum of its proper divisors (2311525).

25426643 is a wasteful number, since it uses less digits than its factorization.

25426643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311524.

The product of its digits is 34560, while the sum is 32.

The square root of 25426643 is about 5042.4838125670. The cubic root of 25426643 is about 294.0557493736.

The spelling of 25426643 in words is "twenty-five million, four hundred twenty-six thousand, six hundred forty-three".