309989894 has 32 divisors (see below), whose sum is σ = 494484480. Its totient is φ = 145533600.

The previous prime is 309989893. The next prime is 309989899. The reversal of 309989894 is 498989903.

309989894 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309989891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303104 + ... + 304124.

It is an arithmetic number, because the mean of its divisors is an integer number (15452640).

Almost surely, 2^309989894 is an apocalyptic number.

309989894 is a deficient number, since it is larger than the sum of its proper divisors (184494586).

309989894 is a wasteful number, since it uses less digits than its factorization.

309989894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The square root of 309989894 is about 17606.5298682051. The cubic root of 309989894 is about 676.7825906800.

The spelling of 309989894 in words is "three hundred nine million, nine hundred eighty-nine thousand, eight hundred ninety-four".