309842194 has 4 divisors (see below), whose sum is σ = 464763294. Its totient is φ = 154921096.

The previous prime is 309842161. The next prime is 309842209. The reversal of 309842194 is 491248903.

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., 246081969 + 63760225 = 15687^2 + 7985^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77460547 + ... + 77460550.

Almost surely, 2^309842194 is an apocalyptic number.

309842194 is a deficient number, since it is larger than the sum of its proper divisors (154921100).

309842194 is a wasteful number, since it uses less digits than its factorization.

309842194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154921099.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 309842194 is about 17602.3349019384. The cubic root of 309842194 is about 676.6750853809.

The spelling of 309842194 in words is "three hundred nine million, eight hundred forty-two thousand, one hundred ninety-four".