39988993 has 4 divisors (see below), whose sum is σ = 43624368. Its totient is φ = 36353620.

The previous prime is 39988951. The next prime is 39989009.

39988993 is nontrivially palindromic in base 10.

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 a de Polignac number, because none of the positive numbers 2^k-39988993 is a prime.

It is a super-2 number, since 2×39988993² = 3198239122308098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39988903) 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, 1817671 + ... + 1817692.

It is an arithmetic number, because the mean of its divisors is an integer number (10906092).

Almost surely, 2^39988993 is an apocalyptic number.

It is an amenable number.

39988993 is a deficient number, since it is larger than the sum of its proper divisors (3635375).

39988993 is a wasteful number, since it uses less digits than its factorization.

39988993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635374.

The product of its digits is 3779136, while the sum is 58.

The square root of 39988993 is about 6323.6850807105. The cubic root of 39988993 is about 341.9638169488.

The spelling of 39988993 in words is "thirty-nine million, nine hundred eighty-eight thousand, nine hundred ninety-three".