25440542 has 4 divisors (see below), whose sum is σ = 38160816. Its totient is φ = 12720270.

The previous prime is 25440539. The next prime is 25440557. The reversal of 25440542 is 24504452.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 6360134 + ... + 6360137.

It is an arithmetic number, because the mean of its divisors is an integer number (9540204).

Almost surely, 2^25440542 is an apocalyptic number.

25440542 is a deficient number, since it is larger than the sum of its proper divisors (12720274).

25440542 is a wasteful number, since it uses less digits than its factorization.

25440542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12720273.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 25440542 is about 5043.8618141262. The cubic root of 25440542 is about 294.1093196434.

Adding to 25440542 its reverse (24504452), we get a palindrome (49944994).

The spelling of 25440542 in words is "twenty-five million, four hundred forty thousand, five hundred forty-two".