25993990 has 32 divisors (see below), whose sum is σ = 51819264. Its totient is φ = 9308640.

The previous prime is 25993967. The next prime is 25994011. The reversal of 25993990 is 9939952.

It is a happy number.

It is a super-2 number, since 2×25993990² = 1351375032240200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25993990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5607 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (1619352).

Almost surely, 2^25993990 is an apocalyptic number.

25993990 is a deficient number, since it is larger than the sum of its proper divisors (25825274).

25993990 is a wasteful number, since it uses less digits than its factorization.

25993990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612.

The product of its (nonzero) digits is 196830, while the sum is 46.

The square root of 25993990 is about 5098.4301505463. The cubic root of 25993990 is about 296.2267786697.

It can be divided in two parts, 259 and 93990, that added together give a palindrome (94249).

The spelling of 25993990 in words is "twenty-five million, nine hundred ninety-three thousand, nine hundred ninety".