39639939 has 8 divisors (see below), whose sum is σ = 53597952. Its totient is φ = 26054280.

The previous prime is 39639911. The next prime is 39639959. The reversal of 39639939 is 93993693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39639939 - 2¹¹ = 39637891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39639891 and 39639900.

It is not an unprimeable number, because it can be changed into a prime (39639959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92839 + ... + 93264.

It is an arithmetic number, because the mean of its divisors is an integer number (6699744).

Almost surely, 2^39639939 is an apocalyptic number.

39639939 is a deficient number, since it is larger than the sum of its proper divisors (13958013).

39639939 is a wasteful number, since it uses less digits than its factorization.

39639939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186177.

The product of its digits is 1062882, while the sum is 51.

The square root of 39639939 is about 6296.0256511549. The cubic root of 39639939 is about 340.9659354293.

The spelling of 39639939 in words is "thirty-nine million, six hundred thirty-nine thousand, nine hundred thirty-nine".