39393938 has 4 divisors (see below), whose sum is σ = 59090910. Its totient is φ = 19696968.

The previous prime is 39393899. The next prime is 39393971. The reversal of 39393938 is 83939393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83939393 = 3469 ⋅24197.

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 18809569 = 4537^2 + 4337^2 .

It is a super-2 number, since 2×39393938² = 3103764702295688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39393892 and 39393901.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9848483 + ... + 9848486.

Almost surely, 2^39393938 is an apocalyptic number.

39393938 is a deficient number, since it is larger than the sum of its proper divisors (19696972).

39393938 is a wasteful number, since it uses less digits than its factorization.

39393938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19696971.

The product of its digits is 472392, while the sum is 47.

The square root of 39393938 is about 6276.4590335634. The cubic root of 39393938 is about 340.2591392341.

The spelling of 39393938 in words is "thirty-nine million, three hundred ninety-three thousand, nine hundred thirty-eight".