18894390 has 32 divisors (see below), whose sum is σ = 45467136. Its totient is φ = 5025120.

The previous prime is 18894389. The next prime is 18894397. The reversal of 18894390 is 9349881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18894397) 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, 16579 + ... + 17681.

It is an arithmetic number, because the mean of its divisors is an integer number (1420848).

Almost surely, 2^18894390 is an apocalyptic number.

18894390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18894390 is an abundant number, since it is smaller than the sum of its proper divisors (26572746).

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

18894390 is a wasteful number, since it uses less digits than its factorization.

18894390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18894390 is about 4346.7677646730. The cubic root of 18894390 is about 266.3448426689.

The spelling of 18894390 in words is "eighteen million, eight hundred ninety-four thousand, three hundred ninety".