18925990 has 8 divisors (see below), whose sum is σ = 34066800. Its totient is φ = 7570392.

The previous prime is 18925979. The next prime is 18926021. The reversal of 18925990 is 9952981.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946290 + ... + 946309.

It is an arithmetic number, because the mean of its divisors is an integer number (4258350).

Almost surely, 2^18925990 is an apocalyptic number.

18925990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18925990 is a deficient number, since it is larger than the sum of its proper divisors (15140810).

18925990 is a wasteful number, since it uses less digits than its factorization.

18925990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892606.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 18925990 is about 4350.4011309303. The cubic root of 18925990 is about 266.4932431433.

The spelling of 18925990 in words is "eighteen million, nine hundred twenty-five thousand, nine hundred ninety".