398977 has 2 divisors, whose sum is σ = 398978. Its totient is φ = 398976.

The previous prime is 398969. The next prime is 398989. The reversal of 398977 is 779893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295936 + 103041 = 544^2 + 321^2 .

It is a cyclic number.

It is not a de Polignac number, because 398977 - 2³ = 398969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199488 + 199489.

It is an arithmetic number, because the mean of its divisors is an integer number (199489).

2³⁹⁸⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

398977 is a deficient number, since it is larger than the sum of its proper divisors (1).

398977 is an equidigital number, since it uses as much as digits as its factorization.

398977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 398977 is about 631.6462617637. The cubic root of 398977 is about 73.6177636117.

The spelling of 398977 in words is "three hundred ninety-eight thousand, nine hundred seventy-seven".