18523725 has 24 divisors (see below), whose sum is σ = 33411552. Its totient is φ = 8980800.

The previous prime is 18523697. The next prime is 18523777. The reversal of 18523725 is 52732581.

It is not a de Polignac number, because 18523725 - 2⁸ = 18523469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10402 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (1392148).

Almost surely, 2^18523725 is an apocalyptic number.

18523725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18523725 is a deficient number, since it is larger than the sum of its proper divisors (14887827).

18523725 is a wasteful number, since it uses less digits than its factorization.

18523725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22477 (or 22472 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 18523725 is about 4303.9197250878. The cubic root of 18523725 is about 264.5916339940.

Subtracting 18523725 from its reverse (52732581), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 18523725 in words is "eighteen million, five hundred twenty-three thousand, seven hundred twenty-five".