18919346 has 4 divisors (see below), whose sum is σ = 28379022. Its totient is φ = 9459672.

The previous prime is 18919309. The next prime is 18919361. The reversal of 18919346 is 64391981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64391981 = 83 ⋅775807.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 4774225 = 3761^2 + 2185^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729835 + ... + 4729838.

Almost surely, 2^18919346 is an apocalyptic number.

18919346 is a deficient number, since it is larger than the sum of its proper divisors (9459676).

18919346 is an equidigital number, since it uses as much as digits as its factorization.

18919346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9459675.

The product of its digits is 46656, while the sum is 41.

The square root of 18919346 is about 4349.6374561565. The cubic root of 18919346 is about 266.4620551960.

The spelling of 18919346 in words is "eighteen million, nine hundred nineteen thousand, three hundred forty-six".