25989390 has 64 divisors (see below), whose sum is σ = 79211520. Its totient is φ = 5940000.

The previous prime is 25989349. The next prime is 25989391. The reversal of 25989390 is 9398952.

25989390 is a `hidden beast` number, since 259 + 8 + 9 + 390 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25989391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4986 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (1237680).

Almost surely, 2^25989390 is an apocalyptic number.

25989390 is an abundant number, since it is smaller than the sum of its proper divisors (53222130).

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

25989390 is a wasteful number, since it uses less digits than its factorization.

25989390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13774 (or 13768 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 25989390 is about 5097.9790113338. The cubic root of 25989390 is about 296.2093038153.

The spelling of 25989390 in words is "twenty-five million, nine hundred eighty-nine thousand, three hundred ninety".