18922490 has 8 divisors (see below), whose sum is σ = 34060500. Its totient is φ = 7568992.

The previous prime is 18922489. The next prime is 18922511. The reversal of 18922490 is 9422981.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 885481 = 4247^2 + 941^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18922490.

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, 946115 + ... + 946134.

Almost surely, 2^18922490 is an apocalyptic number.

18922490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18922490 is a deficient number, since it is larger than the sum of its proper divisors (15138010).

18922490 is a wasteful number, since it uses less digits than its factorization.

18922490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892256.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18922490 is about 4349.9988505746. The cubic root of 18922490 is about 266.4768145205.

The spelling of 18922490 in words is "eighteen million, nine hundred twenty-two thousand, four hundred ninety".