309689042 has 8 divisors (see below), whose sum is σ = 500266956. Its totient is φ = 142933392.

The previous prime is 309689041. The next prime is 309689059. The reversal of 309689042 is 240986903.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 272613121 + 37075921 = 16511^2 + 6089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (309689041) 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, 5955533 + ... + 5955584.

Almost surely, 2^309689042 is an apocalyptic number.

309689042 is a deficient number, since it is larger than the sum of its proper divisors (190577914).

309689042 is a wasteful number, since it uses less digits than its factorization.

309689042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11911132.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 309689042 is about 17597.9840322692. The cubic root of 309689042 is about 676.5635756893.

The spelling of 309689042 in words is "three hundred nine million, six hundred eighty-nine thousand, forty-two".