18919497 has 8 divisors (see below), whose sum is σ = 26553760. Its totient is φ = 11949120.

The previous prime is 18919493. The next prime is 18919499. The reversal of 18919497 is 79491981.

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

It is not a de Polignac number, because 18919497 - 2² = 18919493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18919493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165904 + ... + 166017.

It is an arithmetic number, because the mean of its divisors is an integer number (3319220).

Almost surely, 2^18919497 is an apocalyptic number.

It is an amenable number.

18919497 is a deficient number, since it is larger than the sum of its proper divisors (7634263).

18919497 is a wasteful number, since it uses less digits than its factorization.

18919497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331943.

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

The square root of 18919497 is about 4349.6548138904. The cubic root of 18919497 is about 266.4627640940.

The spelling of 18919497 in words is "eighteen million, nine hundred nineteen thousand, four hundred ninety-seven".