999899379 has 6 divisors (see below), whose sum is σ = 1444299116. Its totient is φ = 666599580.

The previous prime is 999899333. The next prime is 999899399. The reversal of 999899379 is 973998999.

It is a happy number.

It is not a de Polignac number, because 999899379 - 2¹³ = 999891187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999899399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55549957 + ... + 55549974.

Almost surely, 2^999899379 is an apocalyptic number.

999899379 is a deficient number, since it is larger than the sum of its proper divisors (444399737).

999899379 is a wasteful number, since it uses less digits than its factorization.

999899379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111099937 (or 111099934 counting only the distinct ones).

The product of its digits is 89282088, while the sum is 72.

The square root of 999899379 is about 31621.1856039586. The cubic root of 999899379 is about 999.9664585416.

The spelling of 999899379 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, three hundred seventy-nine".