18966315 has 16 divisors (see below), whose sum is σ = 30919968. Its totient is φ = 9924096.

The previous prime is 18966287. The next prime is 18966341. The reversal of 18966315 is 51366981.

It is not a de Polignac number, because 18966315 - 2⁶ = 18966251 is a prime.

It is a super-2 number, since 2×18966315² = 719442209358450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11134 + ... + 12723.

It is an arithmetic number, because the mean of its divisors is an integer number (1932498).

Almost surely, 2^18966315 is an apocalyptic number.

18966315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18966315 is a deficient number, since it is larger than the sum of its proper divisors (11953653).

18966315 is a wasteful number, since it uses less digits than its factorization.

18966315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23918.

The product of its digits is 38880, while the sum is 39.

The square root of 18966315 is about 4355.0332949359. The cubic root of 18966315 is about 266.6823784145.

The spelling of 18966315 in words is "eighteen million, nine hundred sixty-six thousand, three hundred fifteen".