398804381 has 2 divisors, whose sum is σ = 398804382. Its totient is φ = 398804380.

The previous prime is 398804327. The next prime is 398804407. The reversal of 398804381 is 183408893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398800900 + 3481 = 19970^2 + 59^2 .

It is an emirp because it is prime and its reverse (183408893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398804381 - 2²² = 394610077 is a prime.

It is a super-2 number, since 2×398804381² = 318089868609586322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398803381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199402190 + 199402191.

It is an arithmetic number, because the mean of its divisors is an integer number (199402191).

Almost surely, 2^398804381 is an apocalyptic number.

It is an amenable number.

398804381 is a deficient number, since it is larger than the sum of its proper divisors (1).

398804381 is an equidigital number, since it uses as much as digits as its factorization.

398804381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 398804381 is about 19970.0871555434. The cubic root of 398804381 is about 736.0714507321.

The spelling of 398804381 in words is "three hundred ninety-eight million, eight hundred four thousand, three hundred eighty-one".