18966490 has 16 divisors (see below), whose sum is σ = 35624448. Its totient is φ = 7256656.

The previous prime is 18966481. The next prime is 18966511. The reversal of 18966490 is 9466981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41002 + ... + 41461.

It is an arithmetic number, because the mean of its divisors is an integer number (2226528).

Almost surely, 2^18966490 is an apocalyptic number.

18966490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18966490 is a deficient number, since it is larger than the sum of its proper divisors (16657958).

18966490 is a wasteful number, since it uses less digits than its factorization.

18966490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82493.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 18966490 is about 4355.0533865844. The cubic root of 18966490 is about 266.6831986279.

The spelling of 18966490 in words is "eighteen million, nine hundred sixty-six thousand, four hundred ninety".