398663139 has 16 divisors (see below), whose sum is σ = 609475328. Its totient is φ = 227061792.

The previous prime is 398663101. The next prime is 398663143. The reversal of 398663139 is 931366893.

It is a happy number.

It is not a de Polignac number, because 398663139 - 2⁷ = 398663011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398663159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24472 + ... + 37365.

It is an arithmetic number, because the mean of its divisors is an integer number (38092208).

Almost surely, 2^398663139 is an apocalyptic number.

398663139 is a deficient number, since it is larger than the sum of its proper divisors (210812189).

398663139 is a wasteful number, since it uses less digits than its factorization.

398663139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62154.

The product of its digits is 629856, while the sum is 48.

The square root of 398663139 is about 19966.5505032792. The cubic root of 398663139 is about 735.9845438970.

The spelling of 398663139 in words is "three hundred ninety-eight million, six hundred sixty-three thousand, one hundred thirty-nine".