899998642 has 4 divisors (see below), whose sum is σ = 1349997966. Its totient is φ = 449999320.

The previous prime is 899998639. The next prime is 899998661. The reversal of 899998642 is 246899998.

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., 829958481 + 70040161 = 28809^2 + 8369^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224999659 + ... + 224999662.

Almost surely, 2^899998642 is an apocalyptic number.

899998642 is a deficient number, since it is larger than the sum of its proper divisors (449999324).

899998642 is a wasteful number, since it uses less digits than its factorization.

899998642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449999323.

The product of its digits is 20155392, while the sum is 64.

The square root of 899998642 is about 29999.9773666581. The cubic root of 899998642 is about 965.4888990000.

The spelling of 899998642 in words is "eight hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred forty-two".