18506736 has 30 divisors (see below), whose sum is σ = 51793560. Its totient is φ = 6168864.

The previous prime is 18506723. The next prime is 18506737. The reversal of 18506736 is 63760581.

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 18506736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18506737) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64116 + ... + 64403.

It is an arithmetic number, because the mean of its divisors is an integer number (1726452).

Almost surely, 2^18506736 is an apocalyptic number.

18506736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18506736 is an abundant number, since it is smaller than the sum of its proper divisors (33286824).

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

18506736 is a wasteful number, since it uses less digits than its factorization.

18506736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128533 (or 128524 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 18506736 is about 4301.9456063507. The cubic root of 18506736 is about 264.5107193434.

The spelling of 18506736 in words is "eighteen million, five hundred six thousand, seven hundred thirty-six".