398865871 has 8 divisors (see below), whose sum is σ = 416361600. Its totient is φ = 381659520.

The previous prime is 398865869. The next prime is 398865877. The reversal of 398865871 is 178568893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398865871 - 2¹ = 398865869 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 (398865877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69526 + ... + 75043.

It is an arithmetic number, because the mean of its divisors is an integer number (52045200).

Almost surely, 2^398865871 is an apocalyptic number.

398865871 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

398865871 is a deficient number, since it is larger than the sum of its proper divisors (17495729).

398865871 is a wasteful number, since it uses less digits than its factorization.

398865871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144689.

The product of its digits is 2903040, while the sum is 55.

The square root of 398865871 is about 19971.6266488236. The cubic root of 398865871 is about 736.1092793934.

The spelling of 398865871 in words is "three hundred ninety-eight million, eight hundred sixty-five thousand, eight hundred seventy-one".