999998877 has 8 divisors (see below), whose sum is σ = 1333502464. Its totient is φ = 666580608.

The previous prime is 999998869. The next prime is 999998903. The reversal of 999998877 is 778899999.

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

It is not a de Polignac number, because 999998877 - 2³ = 999998869 is a prime.

It is a super-2 number, since 2×999998877² = 1999995508002522258, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999998799 and 999998808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998777) 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, 14733 + ... + 47085.

It is an arithmetic number, because the mean of its divisors is an integer number (166687808).

Almost surely, 2^999998877 is an apocalyptic number.

It is an amenable number.

999998877 is a deficient number, since it is larger than the sum of its proper divisors (333503587).

999998877 is a wasteful number, since it uses less digits than its factorization.

999998877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42659.

The product of its digits is 185177664, while the sum is 75.

The square root of 999998877 is about 31622.7588454897. The cubic root of 999998877 is about 999.9996256665. Note that the first 3 decimals are identical.

The spelling of 999998877 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred seventy-seven".