18742238 has 8 divisors (see below), whose sum is σ = 28767288. Its totient is φ = 9153144.

The previous prime is 18742219. The next prime is 18742249. The reversal of 18742238 is 83224781.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18742198 and 18742207.

It is a congruent 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, 108881 + ... + 109052.

It is an arithmetic number, because the mean of its divisors is an integer number (3595911).

Almost surely, 2^18742238 is an apocalyptic number.

18742238 is a deficient number, since it is larger than the sum of its proper divisors (10025050).

18742238 is a wasteful number, since it uses less digits than its factorization.

18742238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217978.

The product of its digits is 21504, while the sum is 35.

The square root of 18742238 is about 4329.2306475862. The cubic root of 18742238 is about 265.6279778767.

The spelling of 18742238 in words is "eighteen million, seven hundred forty-two thousand, two hundred thirty-eight".