18649725 has 24 divisors (see below), whose sum is σ = 31039680. Its totient is φ = 9880320.

The previous prime is 18649721. The next prime is 18649727. The reversal of 18649725 is 52794681.

It is not a de Polignac number, because 18649725 - 2² = 18649721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18649721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11781 + ... + 13269.

It is an arithmetic number, because the mean of its divisors is an integer number (1293320).

Almost surely, 2^18649725 is an apocalyptic number.

18649725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18649725 is a deficient number, since it is larger than the sum of its proper divisors (12389955).

18649725 is a wasteful number, since it uses less digits than its factorization.

18649725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669 (or 1664 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 18649725 is about 4318.5327369374. The cubic root of 18649725 is about 265.1902040202.

The spelling of 18649725 in words is "eighteen million, six hundred forty-nine thousand, seven hundred twenty-five".