18739073 has 4 divisors (see below), whose sum is σ = 19725360. Its totient is φ = 17752788.

The previous prime is 18739067. The next prime is 18739081. The reversal of 18739073 is 37093781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18739073 - 2¹² = 18734977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18739003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493115 + ... + 493152.

It is an arithmetic number, because the mean of its divisors is an integer number (4931340).

Almost surely, 2^18739073 is an apocalyptic number.

It is an amenable number.

18739073 is a deficient number, since it is larger than the sum of its proper divisors (986287).

18739073 is an equidigital number, since it uses as much as digits as its factorization.

18739073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986286.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 18739073 is about 4328.8650937630. The cubic root of 18739073 is about 265.6130248442.

The spelling of 18739073 in words is "eighteen million, seven hundred thirty-nine thousand, seventy-three".