38993818 has 8 divisors (see below), whose sum is σ = 61931412. Its totient is φ = 18350016.

The previous prime is 38993813. The next prime is 38993831. The reversal of 38993818 is 81839983.

It can be written as a sum of positive squares in 2 ways, for example, as 38975049 + 18769 = 6243^2 + 137^2 .

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

It is not an unprimeable number, because it can be changed into a prime (38993813) 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, 573405 + ... + 573472.

Almost surely, 2^38993818 is an apocalyptic number.

38993818 is a deficient number, since it is larger than the sum of its proper divisors (22937594).

38993818 is a wasteful number, since it uses less digits than its factorization.

38993818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146896.

The product of its digits is 373248, while the sum is 49.

The square root of 38993818 is about 6244.5030226592. The cubic root of 38993818 is about 339.1032250049.

The spelling of 38993818 in words is "thirty-eight million, nine hundred ninety-three thousand, eight hundred eighteen".