39213909 has 16 divisors (see below), whose sum is σ = 66394240. Its totient is φ = 22407840.

The previous prime is 39213907. The next prime is 39213913. The reversal of 39213909 is 90931293.

It is not a de Polignac number, because 39213909 - 2¹ = 39213907 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 (39213907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103552 + ... + 103929.

It is an arithmetic number, because the mean of its divisors is an integer number (4149640).

Almost surely, 2^39213909 is an apocalyptic number.

It is an amenable number.

39213909 is a deficient number, since it is larger than the sum of its proper divisors (27180331).

39213909 is a wasteful number, since it uses less digits than its factorization.

39213909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207497 (or 207491 counting only the distinct ones).

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

The square root of 39213909 is about 6262.1010052537. The cubic root of 39213909 is about 339.7400232927.

The spelling of 39213909 in words is "thirty-nine million, two hundred thirteen thousand, nine hundred nine".