25402861 has 12 divisors (see below), whose sum is σ = 28129500. Its totient is φ = 22922240.

The previous prime is 25402859. The next prime is 25402873. The reversal of 25402861 is 16820452.

It can be written as a sum of positive squares in 2 ways, for example, as 1334025 + 24068836 = 1155^2 + 4906^2 .

It is not a de Polignac number, because 25402861 - 2¹ = 25402859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25402261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17325 + ... + 18733.

It is an arithmetic number, because the mean of its divisors is an integer number (2344125).

Almost surely, 2^25402861 is an apocalyptic number.

It is an amenable number.

25402861 is a deficient number, since it is larger than the sum of its proper divisors (2726639).

25402861 is a wasteful number, since it uses less digits than its factorization.

25402861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25402861 is about 5040.1250976538. The cubic root of 25402861 is about 293.9640422187.

The spelling of 25402861 in words is "twenty-five million, four hundred two thousand, eight hundred sixty-one".