25605142 has 4 divisors (see below), whose sum is σ = 38407716. Its totient is φ = 12802570.

The previous prime is 25605137. The next prime is 25605149. The reversal of 25605142 is 24150652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25605149) by changing a digit.

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, 6401284 + ... + 6401287.

It is an arithmetic number, because the mean of its divisors is an integer number (9601929).

Almost surely, 2^25605142 is an apocalyptic number.

25605142 is a deficient number, since it is larger than the sum of its proper divisors (12802574).

25605142 is a wasteful number, since it uses less digits than its factorization.

25605142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802573.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25605142 is about 5060.1523692474. The cubic root of 25605142 is about 294.7422511639.

Adding to 25605142 its reverse (24150652), we get a palindrome (49755794).

The spelling of 25605142 in words is "twenty-five million, six hundred five thousand, one hundred forty-two".