25939980 has 144 divisors (see below), whose sum is σ = 88929120. Its totient is φ = 6272640.

The previous prime is 25939967. The next prime is 25939987. The reversal of 25939980 is 8993952.

25939980 is a `hidden beast` number, since 259 + 399 + 8 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (25939987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65142 + ... + 65538.

Almost surely, 2^25939980 is an apocalyptic number.

25939980 is a gapful number since it is divisible by the number (20) 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 25939980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44464560).

25939980 is an abundant number, since it is smaller than the sum of its proper divisors (62989140).

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

25939980 is a wasteful number, since it uses less digits than its factorization.

25939980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 418 counting only the distinct ones).

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

The square root of 25939980 is about 5093.1306678702. The cubic root of 25939980 is about 296.0214709285.

The spelling of 25939980 in words is "twenty-five million, nine hundred thirty-nine thousand, nine hundred eighty".