18672336 has 40 divisors (see below), whose sum is σ = 53597760. Its totient is φ = 6223968.

The previous prime is 18672331. The next prime is 18672349. The reversal of 18672336 is 63327681.

It is a happy number.

It is a super-2 number, since 2×18672336² = 697312263393792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18672336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18672331) 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, 21180 + ... + 22043.

It is an arithmetic number, because the mean of its divisors is an integer number (1339944).

Almost surely, 2^18672336 is an apocalyptic number.

18672336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18672336 is an abundant number, since it is smaller than the sum of its proper divisors (34925424).

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

18672336 is a wasteful number, since it uses less digits than its factorization.

18672336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43240 (or 43228 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 18672336 is about 4321.1498469736. The cubic root of 18672336 is about 265.2973332863.

The spelling of 18672336 in words is "eighteen million, six hundred seventy-two thousand, three hundred thirty-six".