18672240 has 40 divisors (see below), whose sum is σ = 57884688. Its totient is φ = 4979200.

The previous prime is 18672221. The next prime is 18672253. The reversal of 18672240 is 4227681.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18672198 and 18672207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38661 + ... + 39140.

Almost surely, 2^18672240 is an apocalyptic number.

18672240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18672240 is an abundant number, since it is smaller than the sum of its proper divisors (39212448).

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

18672240 is a wasteful number, since it uses less digits than its factorization.

18672240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77817 (or 77811 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 18672240 is about 4321.1387388049. The cubic root of 18672240 is about 265.2968786281.

The spelling of 18672240 in words is "eighteen million, six hundred seventy-two thousand, two hundred forty".