39690213 has 4 divisors (see below), whose sum is σ = 52920288. Its totient is φ = 26460140.

The previous prime is 39690193. The next prime is 39690227. The reversal of 39690213 is 31209693.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31209693 = 3 ⋅10403231.

It is a cyclic number.

It is not a de Polignac number, because 39690213 - 2⁸ = 39689957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39690283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615033 + ... + 6615038.

It is an arithmetic number, because the mean of its divisors is an integer number (13230072).

Almost surely, 2^39690213 is an apocalyptic number.

It is an amenable number.

39690213 is a deficient number, since it is larger than the sum of its proper divisors (13230075).

39690213 is a wasteful number, since it uses less digits than its factorization.

39690213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13230074.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 39690213 is about 6300.0169047392. The cubic root of 39690213 is about 341.1100197393.

It can be divided in two parts, 39690 and 213, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 39690213 in words is "thirty-nine million, six hundred ninety thousand, two hundred thirteen".