25181940 has 48 divisors (see below), whose sum is σ = 80583552. Its totient is φ = 5755776.

The previous prime is 25181939. The next prime is 25181953. The reversal of 25181940 is 4918152.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25181898 and 25181907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29559 + ... + 30398.

It is an arithmetic number, because the mean of its divisors is an integer number (1678824).

Almost surely, 2^25181940 is an apocalyptic number.

25181940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25181940 is an abundant number, since it is smaller than the sum of its proper divisors (55401612).

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

25181940 is a wasteful number, since it uses less digits than its factorization.

25181940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59976 (or 59974 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 25181940 is about 5018.1610177435. The cubic root of 25181940 is about 293.1093877268.

The spelling of 25181940 in words is "twenty-five million, one hundred eighty-one thousand, nine hundred forty".