18233740 has 24 divisors (see below), whose sum is σ = 43761312. Its totient is φ = 6251520.

The previous prime is 18233731. The next prime is 18233783. The reversal of 18233740 is 4733281.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18233699 and 18233708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64981 + ... + 65260.

It is an arithmetic number, because the mean of its divisors is an integer number (1823388).

Almost surely, 2^18233740 is an apocalyptic number.

18233740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18233740 is an abundant number, since it is smaller than the sum of its proper divisors (25527572).

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

18233740 is a wasteful number, since it uses less digits than its factorization.

18233740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130257 (or 130255 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 18233740 is about 4270.0983595229. The cubic root of 18233740 is about 263.2036570662.

The spelling of 18233740 in words is "eighteen million, two hundred thirty-three thousand, seven hundred forty".