398149679 has 4 divisors (see below), whose sum is σ = 398562384. Its totient is φ = 397736976.

The previous prime is 398149663. The next prime is 398149681. The reversal of 398149679 is 976941893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976941893 = 149 ⋅6556657.

It is a cyclic number.

It is not a de Polignac number, because 398149679 - 2⁴ = 398149663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398149649) 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 3 ways as a sum of consecutive naturals, for example, 204902 + ... + 206835.

It is an arithmetic number, because the mean of its divisors is an integer number (99640596).

Almost surely, 2^398149679 is an apocalyptic number.

398149679 is a deficient number, since it is larger than the sum of its proper divisors (412705).

398149679 is an equidigital number, since it uses as much as digits as its factorization.

398149679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412704.

The product of its digits is 2939328, while the sum is 56.

The square root of 398149679 is about 19953.6883557903. The cubic root of 398149679 is about 735.6684366025.

The spelling of 398149679 in words is "three hundred ninety-eight million, one hundred forty-nine thousand, six hundred seventy-nine".