899640369 has 12 divisors (see below), whose sum is σ = 1306286592. Its totient is φ = 596619000.

The previous prime is 899640341. The next prime is 899640389. The reversal of 899640369 is 963046998.

It is a happy number.

It is not a de Polignac number, because 899640369 - 2⁵ = 899640337 is a prime.

It is a super-2 number, since 2×899640369² = 1618705587068912322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (899640389) 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 11 ways as a sum of consecutive naturals, for example, 259957 + ... + 263394.

It is an arithmetic number, because the mean of its divisors is an integer number (108857216).

Almost surely, 2^899640369 is an apocalyptic number.

It is an amenable number.

899640369 is a deficient number, since it is larger than the sum of its proper divisors (406646223).

899640369 is a wasteful number, since it uses less digits than its factorization.

899640369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523548 (or 523545 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 899640369 is about 29994.0055511097. The cubic root of 899640369 is about 965.3607675050.

It can be divided in two parts, 899640 and 369, that added together give a palindrome (900009).

The spelling of 899640369 in words is "eight hundred ninety-nine million, six hundred forty thousand, three hundred sixty-nine".