309672938 has 4 divisors (see below), whose sum is σ = 464509410. Its totient is φ = 154836468.

The previous prime is 309672931. The next prime is 309672949. The reversal of 309672938 is 839276903.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 258019969 + 51652969 = 16063^2 + 7187^2 .

It is a junction number, because it is equal to n+sod(n) for n = 309672892 and 309672901.

It is not an unprimeable number, because it can be changed into a prime (309672931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77418233 + ... + 77418236.

Almost surely, 2^309672938 is an apocalyptic number.

309672938 is a deficient number, since it is larger than the sum of its proper divisors (154836472).

309672938 is a wasteful number, since it uses less digits than its factorization.

309672938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154836471.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 309672938 is about 17597.5264739110. The cubic root of 309672938 is about 676.5518482604.

The spelling of 309672938 in words is "three hundred nine million, six hundred seventy-two thousand, nine hundred thirty-eight".