999904042 has 8 divisors (see below), whose sum is σ = 1528155396. Its totient is φ = 490518912.

The previous prime is 999904007. The next prime is 999904063. The reversal of 999904042 is 240409999.

It can be written as a sum of positive squares in 2 ways, for example, as 993447361 + 6456681 = 31519^2 + 2541^2 .

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 = 999903983 and 999904001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4716423 + ... + 4716634.

Almost surely, 2^999904042 is an apocalyptic number.

999904042 is a deficient number, since it is larger than the sum of its proper divisors (528251354).

999904042 is a wasteful number, since it uses less digits than its factorization.

999904042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433112.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 999904042 is about 31621.2593360859. The cubic root of 999904042 is about 999.9680129768.

The spelling of 999904042 in words is "nine hundred ninety-nine million, nine hundred four thousand, forty-two".