309342213 has 16 divisors (see below), whose sum is σ = 460824000. Its totient is φ = 205085520.

The previous prime is 309342197. The next prime is 309342223. The reversal of 309342213 is 312243903.

It is a happy number.

309342213 is a `hidden beast` number, since 309 + 342 + 2 + 13 = 666.

It is not a de Polignac number, because 309342213 - 2⁴ = 309342197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309342223) 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, 26763 + ... + 36536.

It is an arithmetic number, because the mean of its divisors is an integer number (28801500).

Almost surely, 2^309342213 is an apocalyptic number.

It is an amenable number.

309342213 is a deficient number, since it is larger than the sum of its proper divisors (151481787).

309342213 is a wasteful number, since it uses less digits than its factorization.

309342213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63489 (or 63483 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 309342213 is about 17588.1270463913. The cubic root of 309342213 is about 676.3109141604.

The spelling of 309342213 in words is "three hundred nine million, three hundred forty-two thousand, two hundred thirteen".