999899378 has 32 divisors (see below), whose sum is σ = 1609911936. Its totient is φ = 464683648.

The previous prime is 999899333. The next prime is 999899399. The reversal of 999899378 is 873998999.

999899378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×999899378² = 1999597532249573768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258950 + ... + 262782.

It is an arithmetic number, because the mean of its divisors is an integer number (50309748).

Almost surely, 2^999899378 is an apocalyptic number.

999899378 is a deficient number, since it is larger than the sum of its proper divisors (610012558).

999899378 is a wasteful number, since it uses less digits than its factorization.

999899378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018.

The product of its digits is 79361856, while the sum is 71.

The square root of 999899378 is about 31621.1855881464. The cubic root of 999899378 is about 999.9664582083.

The spelling of 999899378 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, three hundred seventy-eight".