18843742 has 4 divisors (see below), whose sum is σ = 28265616. Its totient is φ = 9421870.

The previous prime is 18843733. The next prime is 18843793. The reversal of 18843742 is 24734881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24734881 = 17 ⋅1454993.

It is a super-2 number, since 2×18843742² = 710173225125128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710934 + ... + 4710937.

It is an arithmetic number, because the mean of its divisors is an integer number (7066404).

Almost surely, 2^18843742 is an apocalyptic number.

18843742 is a deficient number, since it is larger than the sum of its proper divisors (9421874).

18843742 is an equidigital number, since it uses as much as digits as its factorization.

18843742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421873.

The product of its digits is 43008, while the sum is 37.

The square root of 18843742 is about 4340.9379170866. The cubic root of 18843742 is about 266.1066431272.

The spelling of 18843742 in words is "eighteen million, eight hundred forty-three thousand, seven hundred forty-two".