25440506 has 48 divisors (see below), whose sum is σ = 50369760. Its totient is φ = 9525600.

The previous prime is 25440479. The next prime is 25440521. The reversal of 25440506 is 60504452.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 23681 + ... + 24731.

It is an arithmetic number, because the mean of its divisors is an integer number (1049370).

Almost surely, 2^25440506 is an apocalyptic number.

25440506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25440506 is a deficient number, since it is larger than the sum of its proper divisors (24929254).

25440506 is a wasteful number, since it uses less digits than its factorization.

25440506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25440506 is about 5043.8582454308. The cubic root of 25440506 is about 294.1091809155.

Adding to 25440506 its reverse (60504452), we get a palindrome (85944958).

The spelling of 25440506 in words is "twenty-five million, four hundred forty thousand, five hundred six".