999829870 has 32 divisors (see below), whose sum is σ = 1939573440. Its totient is φ = 368893440.

The previous prime is 999829867. The next prime is 999829879. The reversal of 999829870 is 78928999.

It is a junction number, because it is equal to n+sod(n) for n = 999829799 and 999829808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999829879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279151 + ... + 282709.

It is an arithmetic number, because the mean of its divisors is an integer number (60611670).

Almost surely, 2^999829870 is an apocalyptic number.

999829870 is a deficient number, since it is larger than the sum of its proper divisors (939743570).

999829870 is a wasteful number, since it uses less digits than its factorization.

999829870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The square root of 999829870 is about 31620.0864957704. The cubic root of 999829870 is about 999.9432867837.

The spelling of 999829870 in words is "nine hundred ninety-nine million, eight hundred twenty-nine thousand, eight hundred seventy".