18734642 has 4 divisors (see below), whose sum is σ = 28101966. Its totient is φ = 9367320.

The previous prime is 18734641. The next prime is 18734657. The reversal of 18734642 is 24643781.

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., 9740641 + 8994001 = 3121^2 + 2999^2 .

It is not an unprimeable number, because it can be changed into a prime (18734641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4683659 + ... + 4683662.

Almost surely, 2^18734642 is an apocalyptic number.

18734642 is a deficient number, since it is larger than the sum of its proper divisors (9367324).

18734642 is an equidigital number, since it uses as much as digits as its factorization.

18734642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367323.

The product of its digits is 32256, while the sum is 35.

The square root of 18734642 is about 4328.3532665438. The cubic root of 18734642 is about 265.5920877699.

The spelling of 18734642 in words is "eighteen million, seven hundred thirty-four thousand, six hundred forty-two".