998885977 has 4 divisors (see below), whose sum is σ = 1002077620. Its totient is φ = 995694336.

The previous prime is 998885969. The next prime is 998886013. The reversal of 998885977 is 779588899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30680521 + 968205456 = 5539^2 + 31116^2 .

It is a cyclic number.

It is not a de Polignac number, because 998885977 - 2³ = 998885969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998885477) 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, 1595352 + ... + 1595977.

It is an arithmetic number, because the mean of its divisors is an integer number (250519405).

Almost surely, 2^998885977 is an apocalyptic number.

It is an amenable number.

998885977 is a deficient number, since it is larger than the sum of its proper divisors (3191643).

998885977 is a wasteful number, since it uses less digits than its factorization.

998885977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191642.

The product of its digits is 91445760, while the sum is 70.

The square root of 998885977 is about 31605.1574430503. The cubic root of 998885977 is about 999.6285210205.

The spelling of 998885977 in words is "nine hundred ninety-eight million, eight hundred eighty-five thousand, nine hundred seventy-seven".