309747946 has 16 divisors (see below), whose sum is σ = 490276800. Its totient is φ = 146473888.

The previous prime is 309747943. The next prime is 309747959. The reversal of 309747946 is 649747903.

It is a self number, because there is not a number n which added to its sum of digits gives 309747946.

It is not an unprimeable number, because it can be changed into a prime (309747941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33736 + ... + 41923.

It is an arithmetic number, because the mean of its divisors is an integer number (30642300).

Almost surely, 2^309747946 is an apocalyptic number.

309747946 is a deficient number, since it is larger than the sum of its proper divisors (180528854).

309747946 is a wasteful number, since it uses less digits than its factorization.

309747946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75773.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The square root of 309747946 is about 17599.6575534867. The cubic root of 309747946 is about 676.6064679339.

The spelling of 309747946 in words is "three hundred nine million, seven hundred forty-seven thousand, nine hundred forty-six".