398353861 has 2 divisors, whose sum is σ = 398353862. Its totient is φ = 398353860.

The previous prime is 398353853. The next prime is 398353871. The reversal of 398353861 is 168353893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392277636 + 6076225 = 19806^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 398353861 - 2³ = 398353853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398353871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199176930 + 199176931.

It is an arithmetic number, because the mean of its divisors is an integer number (199176931).

Almost surely, 2^398353861 is an apocalyptic number.

It is an amenable number.

398353861 is a deficient number, since it is larger than the sum of its proper divisors (1).

398353861 is an equidigital number, since it uses as much as digits as its factorization.

398353861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 398353861 is about 19958.8040974403. The cubic root of 398353861 is about 735.7941720488.

The spelling of 398353861 in words is "three hundred ninety-eight million, three hundred fifty-three thousand, eight hundred sixty-one".