18396972 has 36 divisors (see below), whose sum is σ = 50732136. Its totient is φ = 5574720.

The previous prime is 18396947. The next prime is 18396979. The reversal of 18396972 is 27969381.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22833 + ... + 23624.

It is an arithmetic number, because the mean of its divisors is an integer number (1409226).

Almost surely, 2^18396972 is an apocalyptic number.

18396972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18396972 is an abundant number, since it is smaller than the sum of its proper divisors (32335164).

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

18396972 is a wasteful number, since it uses less digits than its factorization.

18396972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46478 (or 46473 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 18396972 is about 4289.1691503134. The cubic root of 18396972 is about 263.9867417584.

It can be divided in two parts, 183969 and 72, that added together give a square (184041 = 429²).

The spelling of 18396972 in words is "eighteen million, three hundred ninety-six thousand, nine hundred seventy-two".