25500042 has 32 divisors (see below), whose sum is σ = 58498560. Its totient is φ = 8225280.

The previous prime is 25500023. The next prime is 25500043. The reversal of 25500042 is 24000552.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25499988 and 25500024.

It is not an unprimeable number, because it can be changed into a prime (25500043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5943 + ... + 9290.

It is an arithmetic number, because the mean of its divisors is an integer number (1828080).

Almost surely, 2^25500042 is an apocalyptic number.

25500042 is an abundant number, since it is smaller than the sum of its proper divisors (32998518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25500042 is a wasteful number, since it uses less digits than its factorization.

25500042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15275 (or 15269 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 25500042 is about 5049.7566277990. The cubic root of 25500042 is about 294.3384274416.

Adding to 25500042 its reverse (24000552), we get a palindrome (49500594).

The spelling of 25500042 in words is "twenty-five million, five hundred thousand, forty-two".