998399766 has 64 divisors (see below), whose sum is σ = 2602188288. Its totient is φ = 247822848.

The previous prime is 998399741. The next prime is 998399777. The reversal of 998399766 is 667993899.

It is a junction number, because it is equal to n+sod(n) for n = 998399697 and 998399706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44500 + ... + 63063.

It is an arithmetic number, because the mean of its divisors is an integer number (40659192).

Almost surely, 2^998399766 is an apocalyptic number.

998399766 is an abundant number, since it is smaller than the sum of its proper divisors (1603788522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998399766 is a wasteful number, since it uses less digits than its factorization.

998399766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107605.

The product of its digits is 39680928, while the sum is 66.

The square root of 998399766 is about 31597.4645501819. The cubic root of 998399766 is about 999.4663038858.

The spelling of 998399766 in words is "nine hundred ninety-eight million, three hundred ninety-nine thousand, seven hundred sixty-six".