25408897 has 4 divisors (see below), whose sum is σ = 26903556. Its totient is φ = 23914240.

The previous prime is 25408861. The next prime is 25408913. The reversal of 25408897 is 79880452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23049601 + 2359296 = 4801^2 + 1536^2 .

It is not a de Polignac number, because 25408897 - 2⁷ = 25408769 is a prime.

It is a super-2 number, since 2×25408897² = 1291224093513218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25408837) 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, 747304 + ... + 747337.

It is an arithmetic number, because the mean of its divisors is an integer number (6725889).

Almost surely, 2^25408897 is an apocalyptic number.

It is an amenable number.

25408897 is a deficient number, since it is larger than the sum of its proper divisors (1494659).

25408897 is a wasteful number, since it uses less digits than its factorization.

25408897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494658.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 25408897 is about 5040.7238567491. The cubic root of 25408897 is about 293.9873234079.

The spelling of 25408897 in words is "twenty-five million, four hundred eight thousand, eight hundred ninety-seven".