39839906 has 4 divisors (see below), whose sum is σ = 59759862. Its totient is φ = 19919952.

The previous prime is 39839873. The next prime is 39839911. The reversal of 39839906 is 60993893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60993893 = 109 ⋅559577.

It can be written as a sum of positive squares in only one way, i.e., 38551681 + 1288225 = 6209^2 + 1135^2 .

It is a super-2 number, since 2×39839906² = 3174436220177672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9959975 + ... + 9959978.

Almost surely, 2^39839906 is an apocalyptic number.

39839906 is a deficient number, since it is larger than the sum of its proper divisors (19919956).

39839906 is a wasteful number, since it uses less digits than its factorization.

39839906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19919955.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 39839906 is about 6311.8860889595. The cubic root of 39839906 is about 341.5383177902.

It can be divided in two parts, 398 and 39906, that added together give a palindrome (40304).

The spelling of 39839906 in words is "thirty-nine million, eight hundred thirty-nine thousand, nine hundred six".