25399120 has 20 divisors (see below), whose sum is σ = 59053140. Its totient is φ = 10159616.

The previous prime is 25399103. The next prime is 25399133. The reversal of 25399120 is 2199352.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 14561856 = 3292^2 + 3816^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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, 158665 + ... + 158824.

It is an arithmetic number, because the mean of its divisors is an integer number (2952657).

Almost surely, 2^25399120 is an apocalyptic number.

25399120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25399120 is an abundant number, since it is smaller than the sum of its proper divisors (33654020).

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

25399120 is a wasteful number, since it uses less digits than its factorization.

25399120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317502 (or 317496 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 25399120 is about 5039.7539622486. The cubic root of 25399120 is about 293.9496111215.

The spelling of 25399120 in words is "twenty-five million, three hundred ninety-nine thousand, one hundred twenty".