18919454 has 4 divisors (see below), whose sum is σ = 28379184. Its totient is φ = 9459726.

The previous prime is 18919451. The next prime is 18919493. The reversal of 18919454 is 45491981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729862 + ... + 4729865.

It is an arithmetic number, because the mean of its divisors is an integer number (7094796).

Almost surely, 2^18919454 is an apocalyptic number.

18919454 is a deficient number, since it is larger than the sum of its proper divisors (9459730).

18919454 is an equidigital number, since it uses as much as digits as its factorization.

18919454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459729.

The product of its digits is 51840, while the sum is 41.

The square root of 18919454 is about 4349.6498709666. The cubic root of 18919454 is about 266.4625622228.

The spelling of 18919454 in words is "eighteen million, nine hundred nineteen thousand, four hundred fifty-four".