18997419 has 16 divisors (see below), whose sum is σ = 29127168. Its totient is φ = 10788672.

The previous prime is 18997417. The next prime is 18997421. The reversal of 18997419 is 91479981.

It is an interprime number because it is at equal distance from previous prime (18997417) and next prime (18997421).

It is not a de Polignac number, because 18997419 - 2¹ = 18997417 is a prime.

It is a super-2 number, since 2×18997419² = 721803857323122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18997411) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 799 + ... + 6215.

It is an arithmetic number, because the mean of its divisors is an integer number (1820448).

Almost surely, 2^18997419 is an apocalyptic number.

18997419 is a deficient number, since it is larger than the sum of its proper divisors (10129749).

18997419 is a wasteful number, since it uses less digits than its factorization.

18997419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5594.

The product of its digits is 163296, while the sum is 48.

The square root of 18997419 is about 4358.6028724810. The cubic root of 18997419 is about 266.8280816151.

The spelling of 18997419 in words is "eighteen million, nine hundred ninety-seven thousand, four hundred nineteen".