18001390 has 32 divisors (see below), whose sum is σ = 36495360. Its totient is φ = 6333600.

The previous prime is 18001381. The next prime is 18001393. The reversal of 18001390 is 9310081.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001393) 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, 771 + ... + 6049.

It is an arithmetic number, because the mean of its divisors is an integer number (1140480).

Almost surely, 2^18001390 is an apocalyptic number.

18001390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18001390 is an abundant number, since it is smaller than the sum of its proper divisors (18493970).

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

18001390 is a wasteful number, since it uses less digits than its factorization.

18001390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 18001390 is about 4242.8044970279. The cubic root of 18001390 is about 262.0808852297.

The spelling of 18001390 in words is "eighteen million, one thousand, three hundred ninety".