18988725 has 36 divisors (see below), whose sum is σ = 36527424. Its totient is φ = 8678880.

The previous prime is 18988721. The next prime is 18988729. The reversal of 18988725 is 52788981.

It is an interprime number because it is at equal distance from previous prime (18988721) and next prime (18988729).

It is not a de Polignac number, because 18988725 - 2² = 18988721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1092 + ... + 6258.

Almost surely, 2^18988725 is an apocalyptic number.

18988725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18988725 is a deficient number, since it is larger than the sum of its proper divisors (17538699).

18988725 is a wasteful number, since it uses less digits than its factorization.

18988725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194 (or 5182 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The square root of 18988725 is about 4357.6054204115. The cubic root of 18988725 is about 266.7873715708.

It can be divided in two parts, 189 and 88725, that multiplied together give a square (16769025 = 4095²).

The spelling of 18988725 in words is "eighteen million, nine hundred eighty-eight thousand, seven hundred twenty-five".