940784921 has 2 divisors, whose sum is σ = 940784922. Its totient is φ = 940784920.

The previous prime is 940784881. The next prime is 940784951. The reversal of 940784921 is 129487049.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 937584400 + 3200521 = 30620^2 + 1789^2 .

It is an emirp because it is prime and its reverse (129487049) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 940784921 - 2⁶ = 940784857 is a prime.

It is not a weakly prime, because it can be changed into another prime (940784951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470392460 + 470392461.

It is an arithmetic number, because the mean of its divisors is an integer number (470392461).

Almost surely, 2^940784921 is an apocalyptic number.

It is an amenable number.

940784921 is a deficient number, since it is larger than the sum of its proper divisors (1).

940784921 is an equidigital number, since it uses as much as digits as its factorization.

940784921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 940784921 is about 30672.2174125054. The cubic root of 940784921 is about 979.8586916204.

The spelling of 940784921 in words is "nine hundred forty million, seven hundred eighty-four thousand, nine hundred twenty-one".