18243477 has 24 divisors (see below), whose sum is σ = 31703360. Its totient is φ = 9875520.

The previous prime is 18243457. The next prime is 18243509. The reversal of 18243477 is 77434281.

It is a happy number.

18243477 is a `hidden beast` number, since 182 + 4 + 3 + 477 = 666.

It is not a de Polignac number, because 18243477 - 2¹⁴ = 18227093 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6424 + ... + 8817.

Almost surely, 2^18243477 is an apocalyptic number.

It is an amenable number.

18243477 is a deficient number, since it is larger than the sum of its proper divisors (13459883).

18243477 is a wasteful number, since it uses less digits than its factorization.

18243477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15273 (or 15270 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 18243477 is about 4271.2383450236. The cubic root of 18243477 is about 263.2504998597.

The spelling of 18243477 in words is "eighteen million, two hundred forty-three thousand, four hundred seventy-seven".