940780309 has 4 divisors (see below), whose sum is σ = 1075177504. Its totient is φ = 806383116.

The previous prime is 940780303. The next prime is 940780381. The reversal of 940780309 is 903087049.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 940780309 - 2⁵ = 940780277 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 (940780303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67198587 + ... + 67198600.

It is an arithmetic number, because the mean of its divisors is an integer number (268794376).

Almost surely, 2^940780309 is an apocalyptic number.

It is an amenable number.

940780309 is a deficient number, since it is larger than the sum of its proper divisors (134397195).

940780309 is a wasteful number, since it uses less digits than its factorization.

940780309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134397194.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 940780309 is about 30672.1422303692. The cubic root of 940780309 is about 979.8570904342.

The spelling of 940780309 in words is "nine hundred forty million, seven hundred eighty thousand, three hundred nine".