999999442 has 32 divisors (see below), whose sum is σ = 1658189232. Its totient is φ = 449439744.

The previous prime is 999999433. The next prime is 999999487. The reversal of 999999442 is 244999999.

It can be written as a sum of positive squares in 8 ways, for example, as 632472201 + 367527241 = 25149^2 + 19171^2 .

It is a super-2 number, since 2×999999442² = 1999997768000622728, which contains 22 as substring.

It is a nialpdrome in base 10.

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, 186138 + ... + 191434.

Almost surely, 2^999999442 is an apocalyptic number.

999999442 is a deficient number, since it is larger than the sum of its proper divisors (658189790).

999999442 is a wasteful number, since it uses less digits than its factorization.

999999442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502.

The product of its digits is 17006112, while the sum is 64.

The square root of 999999442 is about 31622.7677789279. The cubic root of 999999442 is about 999.9998140000. Note that the first 3 decimals are identical.

The spelling of 999999442 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred forty-two".