18890390 has 8 divisors (see below), whose sum is σ = 34002720. Its totient is φ = 7556152.

The previous prime is 18890371. The next prime is 18890411. The reversal of 18890390 is 9309881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 944510 + ... + 944529.

It is an arithmetic number, because the mean of its divisors is an integer number (4250340).

Almost surely, 2^18890390 is an apocalyptic number.

18890390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18890390 is a deficient number, since it is larger than the sum of its proper divisors (15112330).

18890390 is a wasteful number, since it uses less digits than its factorization.

18890390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889046.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18890390 is about 4346.3076283208. The cubic root of 18890390 is about 266.3260460039.

The spelling of 18890390 in words is "eighteen million, eight hundred ninety thousand, three hundred ninety".