398746187 has 4 divisors (see below), whose sum is σ = 455709936. Its totient is φ = 341782440.

The previous prime is 398746163. The next prime is 398746199. The reversal of 398746187 is 781647893.

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 398746187 - 2⁶ = 398746123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398746987) 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, 28481864 + ... + 28481877.

It is an arithmetic number, because the mean of its divisors is an integer number (113927484).

Almost surely, 2^398746187 is an apocalyptic number.

398746187 is a deficient number, since it is larger than the sum of its proper divisors (56963749).

398746187 is an equidigital number, since it uses as much as digits as its factorization.

398746187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56963748.

The product of its digits is 2032128, while the sum is 53.

The square root of 398746187 is about 19968.6300731923. The cubic root of 398746187 is about 736.0356461892.

The spelling of 398746187 in words is "three hundred ninety-eight million, seven hundred forty-six thousand, one hundred eighty-seven".