19218494 has 4 divisors (see below), whose sum is σ = 28827744. Its totient is φ = 9609246.

The previous prime is 19218487. The next prime is 19218509. The reversal of 19218494 is 49481291.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4804622 + ... + 4804625.

It is an arithmetic number, because the mean of its divisors is an integer number (7206936).

Almost surely, 2^19218494 is an apocalyptic number.

19218494 is a deficient number, since it is larger than the sum of its proper divisors (9609250).

19218494 is an equidigital number, since it uses as much as digits as its factorization.

19218494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609249.

The product of its digits is 20736, while the sum is 38.

The square root of 19218494 is about 4383.8902814738. The cubic root of 19218494 is about 267.8591280886.

The spelling of 19218494 in words is "nineteen million, two hundred eighteen thousand, four hundred ninety-four".