398635847 has 4 divisors (see below), whose sum is σ = 401023056. Its totient is φ = 396248640.

The previous prime is 398635841. The next prime is 398635849. The reversal of 398635847 is 748536893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398635847 - 2²² = 394441543 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 (398635841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193354 + ... + 1193687.

It is an arithmetic number, because the mean of its divisors is an integer number (100255764).

Almost surely, 2^398635847 is an apocalyptic number.

398635847 is a deficient number, since it is larger than the sum of its proper divisors (2387209).

398635847 is a wasteful number, since it uses less digits than its factorization.

398635847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387208.

The product of its digits is 4354560, while the sum is 53.

The square root of 398635847 is about 19965.8670485406. The cubic root of 398635847 is about 735.9677486409.

The spelling of 398635847 in words is "three hundred ninety-eight million, six hundred thirty-five thousand, eight hundred forty-seven".