18339742 has 4 divisors (see below), whose sum is σ = 27509616. Its totient is φ = 9169870.

The previous prime is 18339707. The next prime is 18339791. The reversal of 18339742 is 24793381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24793381 = 443 ⋅55967.

It is a super-2 number, since 2×18339742² = 672692273253128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4584934 + ... + 4584937.

It is an arithmetic number, because the mean of its divisors is an integer number (6877404).

Almost surely, 2^18339742 is an apocalyptic number.

18339742 is a deficient number, since it is larger than the sum of its proper divisors (9169874).

18339742 is an equidigital number, since it uses as much as digits as its factorization.

18339742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9169873.

The product of its digits is 36288, while the sum is 37.

The square root of 18339742 is about 4282.4924985340. The cubic root of 18339742 is about 263.7127174153.

The spelling of 18339742 in words is "eighteen million, three hundred thirty-nine thousand, seven hundred forty-two".