309794940 has 144 divisors (see below), whose sum is σ = 1156628928. Its totient is φ = 65359872.

The previous prime is 309794923. The next prime is 309794941. The reversal of 309794940 is 49497903.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309794941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6924 + ... + 25836.

Almost surely, 2^309794940 is an apocalyptic number.

309794940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309794940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (578314464).

309794940 is an abundant number, since it is smaller than the sum of its proper divisors (846833988).

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

309794940 is a wasteful number, since it uses less digits than its factorization.

309794940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18948 (or 18943 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 309794940 is about 17600.9925856470. The cubic root of 309794940 is about 676.6406837502.

The spelling of 309794940 in words is "three hundred nine million, seven hundred ninety-four thousand, nine hundred forty".