18669240 has 48 divisors (see below), whose sum is σ = 60676200. Its totient is φ = 4978368.

The previous prime is 18669173. The next prime is 18669241. The reversal of 18669240 is 4296681.

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

It is a junction number, because it is equal to n+sod(n) for n = 18669195 and 18669204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25570 + ... + 26289.

Almost surely, 2^18669240 is an apocalyptic number.

18669240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18669240 is an abundant number, since it is smaller than the sum of its proper divisors (42006960).

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

18669240 is a wasteful number, since it uses less digits than its factorization.

18669240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51876 (or 51869 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18669240 is about 4320.7915941411. The cubic root of 18669240 is about 265.2826697765.

The spelling of 18669240 in words is "eighteen million, six hundred sixty-nine thousand, two hundred forty".