997877 has 2 divisors, whose sum is σ = 997878. Its totient is φ = 997876.

The previous prime is 997813. The next prime is 997879. The reversal of 997877 is 778799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 343396 = 809^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 997877 - 2⁶ = 997813 is a prime.

Together with 997879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498938 + 498939.

It is an arithmetic number, because the mean of its divisors is an integer number (498939).

2⁹⁹⁷⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

997877 is a deficient number, since it is larger than the sum of its proper divisors (1).

997877 is an equidigital number, since it uses as much as digits as its factorization.

997877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 47.

The square root of 997877 is about 998.9379360100. The cubic root of 997877 is about 99.9291831950.

The spelling of 997877 in words is "nine hundred ninety-seven thousand, eight hundred seventy-seven".