309749899 has 16 divisors (see below), whose sum is σ = 324817920. Its totient is φ = 295011360.

The previous prime is 309749873. The next prime is 309749927. The reversal of 309749899 is 998947903.

It is a cyclic number.

It is not a de Polignac number, because 309749899 - 2²¹ = 307652747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309749819) 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, 1364424 + ... + 1364650.

It is an arithmetic number, because the mean of its divisors is an integer number (20301120).

Almost surely, 2^309749899 is an apocalyptic number.

309749899 is a deficient number, since it is larger than the sum of its proper divisors (15068021).

309749899 is a wasteful number, since it uses less digits than its factorization.

309749899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The square root of 309749899 is about 17599.7130374333. The cubic root of 309749899 is about 676.6078899608.

The spelling of 309749899 in words is "three hundred nine million, seven hundred forty-nine thousand, eight hundred ninety-nine".