39988213 has 4 divisors (see below), whose sum is σ = 40585120. Its totient is φ = 39391308.

The previous prime is 39988181. The next prime is 39988219. The reversal of 39988213 is 31288993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39988213 - 2⁵ = 39988181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39988213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39988219) 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, 298353 + ... + 298486.

It is an arithmetic number, because the mean of its divisors is an integer number (10146280).

Almost surely, 2^39988213 is an apocalyptic number.

It is an amenable number.

39988213 is a deficient number, since it is larger than the sum of its proper divisors (596907).

39988213 is an equidigital number, since it uses as much as digits as its factorization.

39988213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596906.

The product of its digits is 93312, while the sum is 43.

The square root of 39988213 is about 6323.6234075093. The cubic root of 39988213 is about 341.9615935577.

The spelling of 39988213 in words is "thirty-nine million, nine hundred eighty-eight thousand, two hundred thirteen".