899542809 has 48 divisors (see below), whose sum is σ = 1441440000. Its totient is φ = 536047200.

The previous prime is 899542801. The next prime is 899542837. The reversal of 899542809 is 908245998.

899542809 is a `hidden beast` number, since 8 + 99 + 542 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 899542809 - 2³ = 899542801 is a prime.

It is a super-2 number, since 2×899542809² = 1618354530447220962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (899542801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1802442 + ... + 1802940.

It is an arithmetic number, because the mean of its divisors is an integer number (30030000).

Almost surely, 2^899542809 is an apocalyptic number.

It is an amenable number.

899542809 is a deficient number, since it is larger than the sum of its proper divisors (541897191).

899542809 is a wasteful number, since it uses less digits than its factorization.

899542809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The square root of 899542809 is about 29992.3791820522. The cubic root of 899542809 is about 965.3258705972.

The spelling of 899542809 in words is "eight hundred ninety-nine million, five hundred forty-two thousand, eight hundred nine".