18361512 has 96 divisors (see below), whose sum is σ = 55339200. Its totient is φ = 5638464.

The previous prime is 18361493. The next prime is 18361571. The reversal of 18361512 is 21516381.

It is a super-2 number, since 2×18361512² = 674290245852288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 36253 + ... + 36755.

It is an arithmetic number, because the mean of its divisors is an integer number (576450).

Almost surely, 2^18361512 is an apocalyptic number.

18361512 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 18361512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27669600).

18361512 is an abundant number, since it is smaller than the sum of its proper divisors (36977688).

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

18361512 is a wasteful number, since it uses less digits than its factorization.

18361512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 521 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 18361512 is about 4285.0334887840. The cubic root of 18361512 is about 263.8170219678.

Adding to 18361512 its reverse (21516381), we get a palindrome (39877893).

The spelling of 18361512 in words is "eighteen million, three hundred sixty-one thousand, five hundred twelve".