25440022 has 4 divisors (see below), whose sum is σ = 38160036. Its totient is φ = 12720010.

The previous prime is 25440013. The next prime is 25440043. The reversal of 25440022 is 22004452.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 6360004 + ... + 6360007.

It is an arithmetic number, because the mean of its divisors is an integer number (9540009).

Almost surely, 2^25440022 is an apocalyptic number.

25440022 is a deficient number, since it is larger than the sum of its proper divisors (12720014).

25440022 is a wasteful number, since it uses less digits than its factorization.

25440022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12720013.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 25440022 is about 5043.8102660588. The cubic root of 25440022 is about 294.1073157830.

Adding to 25440022 its reverse (22004452), we get a palindrome (47444474).

The spelling of 25440022 in words is "twenty-five million, four hundred forty thousand, twenty-two".