840997933 has 2 divisors, whose sum is σ = 840997934. Its totient is φ = 840997932.

The previous prime is 840997909. The next prime is 840997943. The reversal of 840997933 is 339799048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 838507849 + 2490084 = 28957^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 840997933 - 2¹³ = 840989741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840997943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420498966 + 420498967.

It is an arithmetic number, because the mean of its divisors is an integer number (420498967).

Almost surely, 2^840997933 is an apocalyptic number.

It is an amenable number.

840997933 is a deficient number, since it is larger than the sum of its proper divisors (1).

840997933 is an equidigital number, since it uses as much as digits as its factorization.

840997933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 840997933 is about 28999.9643620471. The cubic root of 840997933 is about 943.9122944258.

The spelling of 840997933 in words is "eight hundred forty million, nine hundred ninety-seven thousand, nine hundred thirty-three".