899869509 has 48 divisors (see below), whose sum is σ = 1625854464. Its totient is φ = 465933600.

The previous prime is 899869441. The next prime is 899869513. The reversal of 899869509 is 905968998.

It is not a de Polignac number, because 899869509 - 2¹² = 899865413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899869559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227422 + ... + 231344.

It is an arithmetic number, because the mean of its divisors is an integer number (33871968).

Almost surely, 2^899869509 is an apocalyptic number.

It is an amenable number.

899869509 is a deficient number, since it is larger than the sum of its proper divisors (725984955).

899869509 is a wasteful number, since it uses less digits than its factorization.

899869509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278 (or 4275 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The square root of 899869509 is about 29997.8250711614. The cubic root of 899869509 is about 965.4427202483.

The spelling of 899869509 in words is "eight hundred ninety-nine million, eight hundred sixty-nine thousand, five hundred nine".