309949672 has 8 divisors (see below), whose sum is σ = 581155650. Its totient is φ = 154974832.

The previous prime is 309949669. The next prime is 309949681. The reversal of 309949672 is 276949903.

It can be written as a sum of positive squares in only one way, i.e., 309267396 + 682276 = 17586^2 + 826^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19371847 + ... + 19371862.

Almost surely, 2^309949672 is an apocalyptic number.

It is an amenable number.

309949672 is a deficient number, since it is larger than the sum of its proper divisors (271205978).

309949672 is a wasteful number, since it uses less digits than its factorization.

309949672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38743715 (or 38743711 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 49.

The square root of 309949672 is about 17605.3875844867. The cubic root of 309949672 is about 676.7533179765.

The spelling of 309949672 in words is "three hundred nine million, nine hundred forty-nine thousand, six hundred seventy-two".