18739642 has 4 divisors (see below), whose sum is σ = 28109466. Its totient is φ = 9369820.

The previous prime is 18739619. The next prime is 18739663. The reversal of 18739642 is 24693781.

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

It can be written as a sum of positive squares in only one way, i.e., 9431041 + 9308601 = 3071^2 + 3051^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18739595 and 18739604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4684909 + ... + 4684912.

Almost surely, 2^18739642 is an apocalyptic number.

18739642 is a deficient number, since it is larger than the sum of its proper divisors (9369824).

18739642 is an equidigital number, since it uses as much as digits as its factorization.

18739642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369823.

The product of its digits is 72576, while the sum is 40.

The square root of 18739642 is about 4328.9308148780. The cubic root of 18739642 is about 265.6157132070.

The spelling of 18739642 in words is "eighteen million, seven hundred thirty-nine thousand, six hundred forty-two".