25991042 has 48 divisors (see below), whose sum is σ = 49922880. Its totient is φ = 9931680.

The previous prime is 25991039. The next prime is 25991071. The reversal of 25991042 is 24019952.

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 23 ways as a sum of consecutive naturals, for example, 113384 + ... + 113612.

It is an arithmetic number, because the mean of its divisors is an integer number (1040060).

Almost surely, 2^25991042 is an apocalyptic number.

25991042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25991042 is a deficient number, since it is larger than the sum of its proper divisors (23931838).

25991042 is a wasteful number, since it uses less digits than its factorization.

25991042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 25991042 is about 5098.1410337495. The cubic root of 25991042 is about 296.2155798046.

It can be divided in two parts, 259910 and 42, that added together give a palindrome (259952).

The spelling of 25991042 in words is "twenty-five million, nine hundred ninety-one thousand, forty-two".