398889766 has 16 divisors (see below), whose sum is σ = 665046288. Its totient is φ = 177892000.

The previous prime is 398889761. The next prime is 398889767. The reversal of 398889766 is 667988893.

It is a super-2 number, since 2×398889766² = 318226090839069512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398889698 and 398889707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398889761) 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, 169885 + ... + 172216.

It is an arithmetic number, because the mean of its divisors is an integer number (41565393).

Almost surely, 2^398889766 is an apocalyptic number.

398889766 is a deficient number, since it is larger than the sum of its proper divisors (266156522).

398889766 is a wasteful number, since it uses less digits than its factorization.

398889766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342167.

The product of its digits is 31352832, while the sum is 64.

The square root of 398889766 is about 19972.2248635449. The cubic root of 398889766 is about 736.1239785535.

The spelling of 398889766 in words is "three hundred ninety-eight million, eight hundred eighty-nine thousand, seven hundred sixty-six".