18739394 has 8 divisors (see below), whose sum is σ = 29078460. Its totient is φ = 9046576.

The previous prime is 18739381. The next prime is 18739421. The reversal of 18739394 is 49393781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17749369 + 990025 = 4213^2 + 995^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161489 + ... + 161604.

Almost surely, 2^18739394 is an apocalyptic number.

18739394 is a deficient number, since it is larger than the sum of its proper divisors (10339066).

18739394 is a wasteful number, since it uses less digits than its factorization.

18739394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323124.

The product of its digits is 163296, while the sum is 44.

The square root of 18739394 is about 4328.9021702968. The cubic root of 18739394 is about 265.6145414844.

The spelling of 18739394 in words is "eighteen million, seven hundred thirty-nine thousand, three hundred ninety-four".