39431993 has 6 divisors (see below), whose sum is σ = 41778954. Its totient is φ = 37088096.

The previous prime is 39431983. The next prime is 39432007. The reversal of 39431993 is 39913493.

It can be written as a sum of positive squares in only one way, i.e., 37112464 + 2319529 = 6092^2 + 1523^2 .

It is not a de Polignac number, because 39431993 - 2⁶ = 39431929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39431993.

It is not an unprimeable number, because it can be changed into a prime (39431923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25130 + ... + 26652.

It is an arithmetic number, because the mean of its divisors is an integer number (6963159).

Almost surely, 2^39431993 is an apocalyptic number.

It is an amenable number.

39431993 is a deficient number, since it is larger than the sum of its proper divisors (2346961).

39431993 is an frugal number, since it uses more digits than its factorization.

39431993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063 (or 1540 counting only the distinct ones).

The product of its digits is 78732, while the sum is 41.

The square root of 39431993 is about 6279.4898678157. The cubic root of 39431993 is about 340.3686687282.

The spelling of 39431993 in words is "thirty-nine million, four hundred thirty-one thousand, nine hundred ninety-three".