899473639 has 4 divisors (see below), whose sum is σ = 918611424. Its totient is φ = 880335856.

The previous prime is 899473591. The next prime is 899473651. The reversal of 899473639 is 936374998.

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

It is a cyclic number.

It is not a de Polignac number, because 899473639 - 2¹³ = 899465447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899473039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9568822 + ... + 9568915.

It is an arithmetic number, because the mean of its divisors is an integer number (229652856).

Almost surely, 2^899473639 is an apocalyptic number.

899473639 is a deficient number, since it is larger than the sum of its proper divisors (19137785).

899473639 is a wasteful number, since it uses less digits than its factorization.

899473639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19137784.

The product of its digits is 8817984, while the sum is 58.

The square root of 899473639 is about 29991.2260336252. The cubic root of 899473639 is about 965.3011271752.

The spelling of 899473639 in words is "eight hundred ninety-nine million, four hundred seventy-three thousand, six hundred thirty-nine".