18943040 has 28 divisors (see below), whose sum is σ = 45108876. Its totient is φ = 7577088.

The previous prime is 18943037. The next prime is 18943079. The reversal of 18943040 is 4034981.

It can be written as a sum of positive squares in 2 ways, for example, as 7054336 + 11888704 = 2656^2 + 3448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18942994 and 18943012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29279 + ... + 29918.

Almost surely, 2^18943040 is an apocalyptic number.

18943040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18943040 is an abundant number, since it is smaller than the sum of its proper divisors (26165836).

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

18943040 is an equidigital number, since it uses as much as digits as its factorization.

18943040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59214 (or 59204 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18943040 is about 4352.3602792048. The cubic root of 18943040 is about 266.5732450531.

The spelling of 18943040 in words is "eighteen million, nine hundred forty-three thousand, forty".