18442690 has 32 divisors (see below), whose sum is σ = 38087424. Its totient is φ = 6298560.

The previous prime is 18442667. The next prime is 18442693. The reversal of 18442690 is 9624481.

It is a super-2 number, since 2×18442690² = 680265628872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18442693) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 33820 + ... + 34360.

It is an arithmetic number, because the mean of its divisors is an integer number (1190232).

Almost surely, 2^18442690 is an apocalyptic number.

18442690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18442690 is an abundant number, since it is smaller than the sum of its proper divisors (19644734).

18442690 is a wasteful number, since it uses less digits than its factorization.

18442690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18442690 is about 4294.4953137709. The cubic root of 18442690 is about 264.2052371752.

The spelling of 18442690 in words is "eighteen million, four hundred forty-two thousand, six hundred ninety".