999899078 has 8 divisors (see below), whose sum is σ = 1525269960. Its totient is φ = 491475760.

The previous prime is 999899077. The next prime is 999899099. The reversal of 999899078 is 870998999.

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

It is a junction number, because it is equal to n+sod(n) for n = 999898999 and 999899017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999899077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4236743 + ... + 4236978.

It is an arithmetic number, because the mean of its divisors is an integer number (190658745).

Almost surely, 2^999899078 is an apocalyptic number.

999899078 is a deficient number, since it is larger than the sum of its proper divisors (525370882).

999899078 is a wasteful number, since it uses less digits than its factorization.

999899078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8473782.

The product of its (nonzero) digits is 26453952, while the sum is 68.

The square root of 999899078 is about 31621.1808444909. The cubic root of 999899078 is about 999.9663582016.

The spelling of 999899078 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, seventy-eight".