309801994 has 4 divisors (see below), whose sum is σ = 464702994. Its totient is φ = 154900996.

The previous prime is 309801967. The next prime is 309802091. The reversal of 309801994 is 499108903.

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., 270174969 + 39627025 = 16437^2 + 6295^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 309801994.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77450497 + ... + 77450500.

Almost surely, 2^309801994 is an apocalyptic number.

309801994 is a deficient number, since it is larger than the sum of its proper divisors (154901000).

309801994 is a wasteful number, since it uses less digits than its factorization.

309801994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154900999.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 309801994 is about 17601.1929709324. The cubic root of 309801994 is about 676.6458193916.

The spelling of 309801994 in words is "three hundred nine million, eight hundred one thousand, nine hundred ninety-four".