309384042 has 16 divisors (see below), whose sum is σ = 675019872. Its totient is φ = 93752720.

The previous prime is 309384041. The next prime is 309384067. The reversal of 309384042 is 240483903.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 309383994 and 309384012.

It is not an unprimeable number, because it can be changed into a prime (309384041) 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, 2343753 + ... + 2343884.

It is an arithmetic number, because the mean of its divisors is an integer number (42188742).

Almost surely, 2^309384042 is an apocalyptic number.

309384042 is an abundant number, since it is smaller than the sum of its proper divisors (365635830).

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

309384042 is a wasteful number, since it uses less digits than its factorization.

309384042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687653.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 309384042 is about 17589.3161322435. The cubic root of 309384042 is about 676.3413961886.

It can be divided in two parts, 30938 and 4042, that added together give a triangular number (34980 = T₂₆₄).

The spelling of 309384042 in words is "three hundred nine million, three hundred eighty-four thousand, forty-two".