309223869 has 4 divisors (see below), whose sum is σ = 412298496. Its totient is φ = 206149244.

The previous prime is 309223867. The next prime is 309223997. The reversal of 309223869 is 968322903.

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 309223869 - 2¹ = 309223867 is a prime.

It is a super-2 number, since 2×309223869² = 191238802318658322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 309223869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309223861) 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, 51537309 + ... + 51537314.

It is an arithmetic number, because the mean of its divisors is an integer number (103074624).

Almost surely, 2^309223869 is an apocalyptic number.

It is an amenable number.

309223869 is a deficient number, since it is larger than the sum of its proper divisors (103074627).

309223869 is a wasteful number, since it uses less digits than its factorization.

309223869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103074626.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 309223869 is about 17584.7624095408. The cubic root of 309223869 is about 676.2246585033.

The spelling of 309223869 in words is "three hundred nine million, two hundred twenty-three thousand, eight hundred sixty-nine".