398612197 has 4 divisors (see below), whose sum is σ = 398659180. Its totient is φ = 398565216.

The previous prime is 398612173. The next prime is 398612251. The reversal of 398612197 is 791216893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 791216893 = 41 ⋅19297973.

It can be written as a sum of positive squares in 2 ways, for example, as 149793121 + 248819076 = 12239^2 + 15774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398612197 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 (398612297) 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, 6822 + ... + 29047.

It is an arithmetic number, because the mean of its divisors is an integer number (99664795).

Almost surely, 2^398612197 is an apocalyptic number.

It is an amenable number.

398612197 is a deficient number, since it is larger than the sum of its proper divisors (46983).

398612197 is a wasteful number, since it uses less digits than its factorization.

398612197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46982.

The product of its digits is 163296, while the sum is 46.

The square root of 398612197 is about 19965.2747789756. The cubic root of 398612197 is about 735.9531940195.

The spelling of 398612197 in words is "three hundred ninety-eight million, six hundred twelve thousand, one hundred ninety-seven".