18958240 has 48 divisors (see below), whose sum is σ = 51190272. Its totient is φ = 6499584.

The previous prime is 18958237. The next prime is 18958241. The reversal of 18958240 is 4285981.

It is a self number, because there is not a number n which added to its sum of digits gives 18958240.

It is not an unprimeable number, because it can be changed into a prime (18958241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7344 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (1066464).

Almost surely, 2^18958240 is an apocalyptic number.

18958240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18958240 is an abundant number, since it is smaller than the sum of its proper divisors (32232032).

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

18958240 is a wasteful number, since it uses less digits than its factorization.

18958240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949 (or 16941 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18958240 is about 4354.1061080318. The cubic root of 18958240 is about 266.6445259395.

The spelling of 18958240 in words is "eighteen million, nine hundred fifty-eight thousand, two hundred forty".