18158712 has 144 divisors (see below), whose sum is σ = 55492920. Its totient is φ = 4942080.

The previous prime is 18158687. The next prime is 18158713. The reversal of 18158712 is 21785181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18158713) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 490758 + ... + 490794.

Almost surely, 2^18158712 is an apocalyptic number.

18158712 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 18158712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27746460).

18158712 is an abundant number, since it is smaller than the sum of its proper divisors (37334208).

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

18158712 is a wasteful number, since it uses less digits than its factorization.

18158712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 66 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 18158712 is about 4261.3040257649. The cubic root of 18158712 is about 262.8421515665.

The spelling of 18158712 in words is "eighteen million, one hundred fifty-eight thousand, seven hundred twelve".