309850000 has 60 divisors (see below), whose sum is σ = 750491028. Its totient is φ = 123920000.

The previous prime is 309849983. The next prime is 309850001. The reversal of 309850000 is 58903.

It can be written as a sum of positive squares in 6 ways, for example, as 267911424 + 41938576 = 16368^2 + 6476^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309850001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46902 + ... + 53098.

Almost surely, 2^309850000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309850000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375245514).

309850000 is an abundant number, since it is smaller than the sum of its proper divisors (440641028).

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

309850000 is an frugal number, since it uses more digits than its factorization.

309850000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6230 (or 6204 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 309850000 is about 17602.5566324895. The cubic root of 309850000 is about 676.6807679310.

The spelling of 309850000 in words is "three hundred nine million, eight hundred fifty thousand".