39945113 has 4 divisors (see below), whose sum is σ = 43017828. Its totient is φ = 36872400.

The previous prime is 39945091. The next prime is 39945119. The reversal of 39945113 is 31154993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31154993 = 79 ⋅394367.

It can be written as a sum of positive squares in 2 ways, for example, as 25482304 + 14462809 = 5048^2 + 3803^2 .

It is a cyclic number.

It is not a de Polignac number, because 39945113 - 2⁸ = 39944857 is a prime.

It is a super-2 number, since 2×39945113² = 3191224105165538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39945119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536338 + ... + 1536363.

It is an arithmetic number, because the mean of its divisors is an integer number (10754457).

Almost surely, 2^39945113 is an apocalyptic number.

It is an amenable number.

39945113 is a deficient number, since it is larger than the sum of its proper divisors (3072715).

39945113 is a wasteful number, since it uses less digits than its factorization.

39945113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072714.

The product of its digits is 14580, while the sum is 35.

The square root of 39945113 is about 6320.2146324314. The cubic root of 39945113 is about 341.8386919833.

The spelling of 39945113 in words is "thirty-nine million, nine hundred forty-five thousand, one hundred thirteen".