940749309 has 20 divisors (see below), whose sum is σ = 1443303004. Its totient is φ = 610213824.

The previous prime is 940749263. The next prime is 940749319. The reversal of 940749309 is 903947049.

It can be written as a sum of positive squares in 2 ways, for example, as 864536409 + 76212900 = 29403^2 + 8730^2 .

It is not a de Polignac number, because 940749309 - 2⁸ = 940749053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940749319) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 153952 + ... + 159945.

Almost surely, 2^940749309 is an apocalyptic number.

It is an amenable number.

940749309 is a deficient number, since it is larger than the sum of its proper divisors (502553695).

940749309 is a wasteful number, since it uses less digits than its factorization.

940749309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313946 (or 313937 counting only the distinct ones).

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

The square root of 940749309 is about 30671.6368816534. The cubic root of 940749309 is about 979.8463277714.

The spelling of 940749309 in words is "nine hundred forty million, seven hundred forty-nine thousand, three hundred nine".