18361672 has 48 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 7610400.

The previous prime is 18361667. The next prime is 18361687. The reversal of 18361672 is 27616381.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11397 + ... + 12907.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^18361672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18361672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20684160).

18361672 is an abundant number, since it is smaller than the sum of its proper divisors (23006648).

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

18361672 is a wasteful number, since it uses less digits than its factorization.

18361672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562 (or 1551 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 18361672 is about 4285.0521583757. The cubic root of 18361672 is about 263.8177882555.

The spelling of 18361672 in words is "eighteen million, three hundred sixty-one thousand, six hundred seventy-two".