18938712 has 64 divisors (see below), whose sum is σ = 51579360. Its totient is φ = 5760000.

The previous prime is 18938701. The next prime is 18938719. The reversal of 18938712 is 21783981.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31212 + ... + 31812.

Almost surely, 2^18938712 is an apocalyptic number.

18938712 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 18938712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25789680).

18938712 is an abundant number, since it is smaller than the sum of its proper divisors (32640648).

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

18938712 is a wasteful number, since it uses less digits than its factorization.

18938712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 720 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 18938712 is about 4351.8630493158. The cubic root of 18938712 is about 266.5529417846.

The spelling of 18938712 in words is "eighteen million, nine hundred thirty-eight thousand, seven hundred twelve".