18733986 has 12 divisors (see below), whose sum is σ = 40590342. Its totient is φ = 6244656.

The previous prime is 18733973. The next prime is 18733987. The reversal of 18733986 is 68933781.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 6095961 = 3555^2 + 2469^2 .

It is not an unprimeable number, because it can be changed into a prime (18733987) 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, 520371 + ... + 520406.

Almost surely, 2^18733986 is an apocalyptic number.

18733986 is an abundant number, since it is smaller than the sum of its proper divisors (21856356).

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

18733986 is a wasteful number, since it uses less digits than its factorization.

18733986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040785 (or 1040782 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18733986 is about 4328.2774864835. The cubic root of 18733986 is about 265.5889878007.

The spelling of 18733986 in words is "eighteen million, seven hundred thirty-three thousand, nine hundred eighty-six".