18156372 has 24 divisors (see below), whose sum is σ = 45624096. Its totient is φ = 5586528.

The previous prime is 18156371. The next prime is 18156377. The reversal of 18156372 is 27365181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58038 + ... + 58349.

It is an arithmetic number, because the mean of its divisors is an integer number (1901004).

Almost surely, 2^18156372 is an apocalyptic number.

18156372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18156372 is an abundant number, since it is smaller than the sum of its proper divisors (27467724).

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

18156372 is a wasteful number, since it uses less digits than its factorization.

18156372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116407 (or 116405 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 18156372 is about 4261.0294530782. The cubic root of 18156372 is about 262.8308608051.

It can be divided in two parts, 18156 and 372, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 18156372 in words is "eighteen million, one hundred fifty-six thousand, three hundred seventy-two".