18005790 has 32 divisors (see below), whose sum is σ = 47143296. Its totient is φ = 4364960.

The previous prime is 18005783. The next prime is 18005807. The reversal of 18005790 is 9750081.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26952 + ... + 27611.

It is an arithmetic number, because the mean of its divisors is an integer number (1473228).

Almost surely, 2^18005790 is an apocalyptic number.

18005790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18005790 is an abundant number, since it is smaller than the sum of its proper divisors (29137506).

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

18005790 is a wasteful number, since it uses less digits than its factorization.

18005790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54584.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 18005790 is about 4243.3229902990. The cubic root of 18005790 is about 262.1022365801.

The spelling of 18005790 in words is "eighteen million, five thousand, seven hundred ninety".