39213989 has 4 divisors (see below), whose sum is σ = 39326700. Its totient is φ = 39101280.

The previous prime is 39213973. The next prime is 39213991. The reversal of 39213989 is 98931293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14760964 + 24453025 = 3842^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 39213989 - 2⁴ = 39213973 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 (39213959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55832 + ... + 56529.

It is an arithmetic number, because the mean of its divisors is an integer number (9831675).

Almost surely, 2^39213989 is an apocalyptic number.

It is an amenable number.

39213989 is a deficient number, since it is larger than the sum of its proper divisors (112711).

39213989 is a wasteful number, since it uses less digits than its factorization.

39213989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112710.

The product of its digits is 104976, while the sum is 44.

The square root of 39213989 is about 6262.1073928830. The cubic root of 39213989 is about 339.7402543263.

The spelling of 39213989 in words is "thirty-nine million, two hundred thirteen thousand, nine hundred eighty-nine".