398549699 has 2 divisors, whose sum is σ = 398549700. Its totient is φ = 398549698.

The previous prime is 398549693. The next prime is 398549731. The reversal of 398549699 is 996945893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398549699 - 2⁸ = 398549443 is a prime.

It is not a weakly prime, because it can be changed into another prime (398549693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199274849 + 199274850.

It is an arithmetic number, because the mean of its divisors is an integer number (199274850).

Almost surely, 2^398549699 is an apocalyptic number.

398549699 is a deficient number, since it is larger than the sum of its proper divisors (1).

398549699 is an equidigital number, since it uses as much as digits as its factorization.

398549699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 62.

The square root of 398549699 is about 19963.7095500811. The cubic root of 398549699 is about 735.9147288922.

The spelling of 398549699 in words is "three hundred ninety-eight million, five hundred forty-nine thousand, six hundred ninety-nine".