99420842 has 8 divisors (see below), whose sum is σ = 149180196. Its totient is φ = 49694112.

The previous prime is 99420833. The next prime is 99420847. The reversal of 99420842 is 24802499.

It is a Cunningham number, because it is equal to 9971²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 99420841 + 1 = 9971^2 + 1^2 .

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 = 99420796 and 99420805.

It is not an unprimeable number, because it can be changed into a prime (99420847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988 + ... + 14240.

Almost surely, 2^99420842 is an apocalyptic number.

99420842 is a deficient number, since it is larger than the sum of its proper divisors (49759354).

99420842 is a wasteful number, since it uses less digits than its factorization.

99420842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16312.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 99420842 is about 9971.0000501454. Note that the first 4 decimals coincide. The cubic root of 99420842 is about 463.2610767826.

The spelling of 99420842 in words is "ninety-nine million, four hundred twenty thousand, eight hundred forty-two".