99999842 has 4 divisors (see below), whose sum is σ = 149999766. Its totient is φ = 49999920.

The previous prime is 99999839. The next prime is 99999847. The reversal of 99999842 is 24899999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 97436641 + 2563201 = 9871^2 + 1601^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999959 + ... + 24999962.

Almost surely, 2^99999842 is an apocalyptic number.

99999842 is a deficient number, since it is larger than the sum of its proper divisors (49999924).

99999842 is a wasteful number, since it uses less digits than its factorization.

99999842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49999923.

The product of its digits is 3779136, while the sum is 59.

The square root of 99999842 is about 9999.9920999969. The cubic root of 99999842 is about 464.1586389041.

The spelling of 99999842 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred forty-two".