18401730 has 32 divisors (see below), whose sum is σ = 44440704. Its totient is φ = 4876416.

The previous prime is 18401717. The next prime is 18401731. The reversal of 18401730 is 3710481.

It is a self number, because there is not a number n which added to its sum of digits gives 18401730.

It is not an unprimeable number, because it can be changed into a prime (18401731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3174 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (1388772).

Almost surely, 2^18401730 is an apocalyptic number.

18401730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18401730 is an abundant number, since it is smaller than the sum of its proper divisors (26038974).

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

18401730 is a wasteful number, since it uses less digits than its factorization.

18401730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18401730 is about 4289.7237673305. The cubic root of 18401730 is about 264.0094980513.

It can be divided in two parts, 1840 and 1730, that added together give a triangular number (3570 = T₈₄).

The spelling of 18401730 in words is "eighteen million, four hundred one thousand, seven hundred thirty".