398731898 has 8 divisors (see below), whose sum is σ = 598514400. Its totient is φ = 199227100.

The previous prime is 398731873. The next prime is 398731903. The reversal of 398731898 is 898137893.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65798 + ... + 71601.

It is an arithmetic number, because the mean of its divisors is an integer number (74814300).

Almost surely, 2^398731898 is an apocalyptic number.

398731898 is a deficient number, since it is larger than the sum of its proper divisors (199782502).

398731898 is a wasteful number, since it uses less digits than its factorization.

398731898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138852.

The product of its digits is 2612736, while the sum is 56.

The square root of 398731898 is about 19968.2722838006. The cubic root of 398731898 is about 736.0268541812.

It can be divided in two parts, 3987 and 31898, that multiplied together give a triangular number (127177326 = T₁₅₉₄₈).

The spelling of 398731898 in words is "three hundred ninety-eight million, seven hundred thirty-one thousand, eight hundred ninety-eight".