25398555 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 10238976.

The previous prime is 25398551. The next prime is 25398559. The reversal of 25398555 is 55589352.

It is an interprime number because it is at equal distance from previous prime (25398551) and next prime (25398559).

It is not a de Polignac number, because 25398555 - 2² = 25398551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25398551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30991 + ... + 31799.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^25398555 is an apocalyptic number.

25398555 is an abundant number, since it is smaller than the sum of its proper divisors (26856165).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25398555 is a wasteful number, since it uses less digits than its factorization.

25398555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its digits is 270000, while the sum is 42.

The square root of 25398555 is about 5039.6979076131. The cubic root of 25398555 is about 293.9474314822.

The spelling of 25398555 in words is "twenty-five million, three hundred ninety-eight thousand, five hundred fifty-five".