842977417 has 2 divisors, whose sum is σ = 842977418. Its totient is φ = 842977416.

The previous prime is 842977403. The next prime is 842977459. The reversal of 842977417 is 714779248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598242681 + 244734736 = 24459^2 + 15644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842977417 is a prime.

It is a super-2 number, since 2×842977417² = 1421221851143983778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842977517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421488708 + 421488709.

It is an arithmetic number, because the mean of its divisors is an integer number (421488709).

Almost surely, 2^842977417 is an apocalyptic number.

It is an amenable number.

842977417 is a deficient number, since it is larger than the sum of its proper divisors (1).

842977417 is an equidigital number, since it uses as much as digits as its factorization.

842977417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 49.

The square root of 842977417 is about 29034.0733793934. The cubic root of 842977417 is about 944.6522864336.

The spelling of 842977417 in words is "eight hundred forty-two million, nine hundred seventy-seven thousand, four hundred seventeen".