999992642 has 24 divisors (see below), whose sum is σ = 1675801596. Its totient is φ = 447084000.

The previous prime is 999992641. The next prime is 999992647. The reversal of 999992642 is 246299999.

It can be written as a sum of positive squares in 2 ways, for example, as 942551401 + 57441241 = 30701^2 + 7579^2 .

It is not an unprimeable number, because it can be changed into a prime (999992641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19109 + ... + 48632.

Almost surely, 2^999992642 is an apocalyptic number.

999992642 is a deficient number, since it is larger than the sum of its proper divisors (675808954).

999992642 is a wasteful number, since it uses less digits than its factorization.

999992642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67826 (or 67815 counting only the distinct ones).

The product of its digits is 5668704, while the sum is 59.

The square root of 999992642 is about 31622.6602612747. The cubic root of 999992642 is about 999.9975473273.

The spelling of 999992642 in words is "nine hundred ninety-nine million, nine hundred ninety-two thousand, six hundred forty-two".