309441869 has 4 divisors (see below), whose sum is σ = 337572960. Its totient is φ = 281310780.

The previous prime is 309441857. The next prime is 309441877. The reversal of 309441869 is 968144903.

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 a de Polignac number, because none of the positive numbers 2^k-309441869 is a prime.

It is a super-2 number, since 2×309441869² = 191508540580426322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309441829) 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, 14065529 + ... + 14065550.

It is an arithmetic number, because the mean of its divisors is an integer number (84393240).

Almost surely, 2^309441869 is an apocalyptic number.

It is an amenable number.

309441869 is a deficient number, since it is larger than the sum of its proper divisors (28131091).

309441869 is a wasteful number, since it uses less digits than its factorization.

309441869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28131090.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 309441869 is about 17590.9598657947. The cubic root of 309441869 is about 676.3835319079.

The spelling of 309441869 in words is "three hundred nine million, four hundred forty-one thousand, eight hundred sixty-nine".