18231072 has 48 divisors (see below), whose sum is σ = 50676192. Its totient is φ = 5719040.

The previous prime is 18231071. The next prime is 18231077. The reversal of 18231072 is 27013281.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (18231071) 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, 3954 + ... + 7217.

It is an arithmetic number, because the mean of its divisors is an integer number (1055754).

Almost surely, 2^18231072 is an apocalyptic number.

18231072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18231072 is an abundant number, since it is smaller than the sum of its proper divisors (32445120).

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

18231072 is a wasteful number, since it uses less digits than its factorization.

18231072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201 (or 11193 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18231072 is about 4269.7859431124. The cubic root of 18231072 is about 263.1908189318.

The spelling of 18231072 in words is "eighteen million, two hundred thirty-one thousand, seventy-two".