25406388 has 72 divisors (see below), whose sum is σ = 75216960. Its totient is φ = 7079040.

The previous prime is 25406387. The next prime is 25406389. The reversal of 25406388 is 88360452.

It is an interprime number because it is at equal distance from previous prime (25406387) and next prime (25406389).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9103 + ... + 11561.

It is an arithmetic number, because the mean of its divisors is an integer number (1044680).

Almost surely, 2^25406388 is an apocalyptic number.

25406388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25406388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37608480).

25406388 is an abundant number, since it is smaller than the sum of its proper divisors (49810572).

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

25406388 is a wasteful number, since it uses less digits than its factorization.

25406388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517 (or 2512 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 25406388 is about 5040.4749776187. The cubic root of 25406388 is about 293.9776465026.

The spelling of 25406388 in words is "twenty-five million, four hundred six thousand, three hundred eighty-eight".