18861925 has 12 divisors (see below), whose sum is σ = 24765156. Its totient is φ = 14201600.

The previous prime is 18861893. The next prime is 18861943. The reversal of 18861925 is 52916881.

It can be written as a sum of positive squares in 6 ways, for example, as 43681 + 18818244 = 209^2 + 4338^2 .

It is not a de Polignac number, because 18861925 - 2⁵ = 18861893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21766 + ... + 22615.

It is an arithmetic number, because the mean of its divisors is an integer number (2063763).

Almost surely, 2^18861925 is an apocalyptic number.

It is an amenable number.

18861925 is a deficient number, since it is larger than the sum of its proper divisors (5903231).

18861925 is a wasteful number, since it uses less digits than its factorization.

18861925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44408 (or 44403 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 18861925 is about 4343.0317751543. The cubic root of 18861925 is about 266.1922075480.

The spelling of 18861925 in words is "eighteen million, eight hundred sixty-one thousand, nine hundred twenty-five".