899640 has 192 divisors, whose sum is σ = 3693600. Its totient is φ = 193536.

The previous prime is 899617. The next prime is 899659. The reversal of 899640 is 46998.

899640 = 64² + 65² + ... + 143².

899640 is a `hidden beast` number, since 8 + 9 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 899595 and 899604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52912 + ... + 52928.

2⁸⁹⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 899640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1846800).

899640 is an abundant number, since it is smaller than the sum of its proper divisors (2793960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

899640 is a wasteful number, since it uses less digits than its factorization.

899640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 899640 is about 948.4935424134. The cubic root of 899640 is about 96.5360635520.

The spelling of 899640 in words is "eight hundred ninety-nine thousand, six hundred forty".