309346649 has 4 divisors (see below), whose sum is σ = 310523136. Its totient is φ = 308170164.

The previous prime is 309346643. The next prime is 309346679. The reversal of 309346649 is 946643903.

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 309346649 - 2⁴ = 309346633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309346643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587849 + ... + 588374.

It is an arithmetic number, because the mean of its divisors is an integer number (77630784).

Almost surely, 2^309346649 is an apocalyptic number.

It is an amenable number.

309346649 is a deficient number, since it is larger than the sum of its proper divisors (1176487).

309346649 is a wasteful number, since it uses less digits than its factorization.

309346649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176486.

The product of its (nonzero) digits is 419904, while the sum is 44.

The square root of 309346649 is about 17588.2531537387. The cubic root of 309346649 is about 676.3141469349.

The spelling of 309346649 in words is "three hundred nine million, three hundred forty-six thousand, six hundred forty-nine".