398831099 has 2 divisors, whose sum is σ = 398831100. Its totient is φ = 398831098.

The previous prime is 398831093. The next prime is 398831107. The reversal of 398831099 is 990138893.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398831099 is a prime.

It is not a weakly prime, because it can be changed into another prime (398831093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199415549 + 199415550.

It is an arithmetic number, because the mean of its divisors is an integer number (199415550).

Almost surely, 2^398831099 is an apocalyptic number.

398831099 is a deficient number, since it is larger than the sum of its proper divisors (1).

398831099 is an equidigital number, since it uses as much as digits as its factorization.

398831099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 398831099 is about 19970.7560948503. The cubic root of 398831099 is about 736.0878881291.

The spelling of 398831099 in words is "three hundred ninety-eight million, eight hundred thirty-one thousand, ninety-nine".