397951 has 2 divisors, whose sum is σ = 397952. Its totient is φ = 397950.

The previous prime is 397939. The next prime is 397963. The reversal of 397951 is 159793.

It is a balanced prime because it is at equal distance from previous prime (397939) and next prime (397963).

It is an emirp because it is prime and its reverse (159793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198975 + 198976.

It is an arithmetic number, because the mean of its divisors is an integer number (198976).

2³⁹⁷⁹⁵¹ is an apocalyptic number.

397951 is a deficient number, since it is larger than the sum of its proper divisors (1).

397951 is an equidigital number, since it uses as much as digits as its factorization.

397951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8505, while the sum is 34.

The square root of 397951 is about 630.8335755173. The cubic root of 397951 is about 73.5546048637.

The spelling of 397951 in words is "three hundred ninety-seven thousand, nine hundred fifty-one".