309442689 has 24 divisors (see below), whose sum is σ = 461066112. Its totient is φ = 199879200.

The previous prime is 309442613. The next prime is 309442699. The reversal of 309442689 is 986244903.

It is not a de Polignac number, because 309442689 - 2⁷ = 309442561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309442699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39102 + ... + 46344.

It is an arithmetic number, because the mean of its divisors is an integer number (19211088).

Almost surely, 2^309442689 is an apocalyptic number.

It is an amenable number.

309442689 is a deficient number, since it is larger than the sum of its proper divisors (151623423).

309442689 is a wasteful number, since it uses less digits than its factorization.

309442689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7397 (or 7394 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 309442689 is about 17590.9831732055. The cubic root of 309442689 is about 676.3841293642.

It can be divided in two parts, 30944 and 2689, that added together give a palindrome (33633).

The spelling of 309442689 in words is "three hundred nine million, four hundred forty-two thousand, six hundred eighty-nine".