18397512 has 96 divisors (see below), whose sum is σ = 57545280. Its totient is φ = 5201280.

The previous prime is 18397501. The next prime is 18397517. The reversal of 18397512 is 21579381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18397517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87087 + ... + 87297.

It is an arithmetic number, because the mean of its divisors is an integer number (599430).

Almost surely, 2^18397512 is an apocalyptic number.

18397512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18397512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28772640).

18397512 is an abundant number, since it is smaller than the sum of its proper divisors (39147768).

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

18397512 is a wasteful number, since it uses less digits than its factorization.

18397512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 396 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 18397512 is about 4289.2320991059. The cubic root of 18397512 is about 263.9893246372.

The spelling of 18397512 in words is "eighteen million, three hundred ninety-seven thousand, five hundred twelve".