39909213 has 8 divisors (see below), whose sum is σ = 59124800. Its totient is φ = 26606124.

The previous prime is 39909187. The next prime is 39909223. The reversal of 39909213 is 31290993.

It is a de Polignac number, because none of the positive numbers 2^k-39909213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39909223) 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, 739033 + ... + 739086.

It is an arithmetic number, because the mean of its divisors is an integer number (7390600).

Almost surely, 2^39909213 is an apocalyptic number.

It is an amenable number.

39909213 is a deficient number, since it is larger than the sum of its proper divisors (19215587).

39909213 is a wasteful number, since it uses less digits than its factorization.

39909213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478128 (or 1478122 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 39909213 is about 6317.3739006014. The cubic root of 39909213 is about 341.7362540263.

It can be divided in two parts, 3990 and 9213, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 39909213 in words is "thirty-nine million, nine hundred nine thousand, two hundred thirteen".