309897402 has 16 divisors (see below), whose sum is σ = 619995360. Its totient is φ = 103265712.

The previous prime is 309897397. The next prime is 309897407. The reversal of 309897402 is 204798903.

309897402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (309897397) and next prime (309897407).

It is not an unprimeable number, because it can be changed into a prime (309897407) 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, 18249 + ... + 30867.

It is an arithmetic number, because the mean of its divisors is an integer number (38749710).

Almost surely, 2^309897402 is an apocalyptic number.

309897402 is an abundant number, since it is smaller than the sum of its proper divisors (310097958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309897402 is a wasteful number, since it uses less digits than its factorization.

309897402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16717.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 309897402 is about 17603.9030331344. The cubic root of 309897402 is about 676.7152732144.

The spelling of 309897402 in words is "three hundred nine million, eight hundred ninety-seven thousand, four hundred two".