39911993 has 4 divisors (see below), whose sum is σ = 43540368. Its totient is φ = 36283620.

The previous prime is 39911981. The next prime is 39911999.

39911993 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 not a de Polignac number, because 39911993 - 2¹⁸ = 39649849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39911999) 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, 1814171 + ... + 1814192.

It is an arithmetic number, because the mean of its divisors is an integer number (10885092).

Almost surely, 2^39911993 is an apocalyptic number.

It is an amenable number.

39911993 is a deficient number, since it is larger than the sum of its proper divisors (3628375).

39911993 is a wasteful number, since it uses less digits than its factorization.

39911993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628374.

The product of its digits is 59049, while the sum is 44.

The square root of 39911993 is about 6317.5939249053. The cubic root of 39911993 is about 341.7441887416.

It can be divided in two parts, 39911 and 993, that added together give a palindrome (40904).

The spelling of 39911993 in words is "thirty-nine million, nine hundred eleven thousand, nine hundred ninety-three".