940809399 has 16 divisors (see below), whose sum is σ = 1274918400. Its totient is φ = 617017856.

The previous prime is 940809383. The next prime is 940809403. The reversal of 940809399 is 993908049.

It is a cyclic number.

It is not a de Polignac number, because 940809399 - 2⁴ = 940809383 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940809349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51607 + ... + 67415.

It is an arithmetic number, because the mean of its divisors is an integer number (79682400).

Almost surely, 2^940809399 is an apocalyptic number.

940809399 is a deficient number, since it is larger than the sum of its proper divisors (334109001).

940809399 is a wasteful number, since it uses less digits than its factorization.

940809399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16134.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 940809399 is about 30672.6164355113. The cubic root of 940809399 is about 979.8671897629.

The spelling of 940809399 in words is "nine hundred forty million, eight hundred nine thousand, three hundred ninety-nine".