309090940 has 24 divisors (see below), whose sum is σ = 687273552. Its totient is φ = 116363520.

The previous prime is 309090931. The next prime is 309090959. The reversal of 309090940 is 49090903.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 309090896 and 309090905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454206 + ... + 454885.

It is an arithmetic number, because the mean of its divisors is an integer number (28636398).

Almost surely, 2^309090940 is an apocalyptic number.

It is an amenable number.

309090940 is an abundant number, since it is smaller than the sum of its proper divisors (378182612).

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

309090940 is a wasteful number, since it uses less digits than its factorization.

309090940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909117 (or 909115 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 309090940 is about 17580.9823388797. The cubic root of 309090940 is about 676.1277462440.

The spelling of 309090940 in words is "three hundred nine million, ninety thousand, nine hundred forty".