899778 has 16 divisors (see below), whose sum is σ = 1963296. Its totient is φ = 272640.

The previous prime is 899761. The next prime is 899779. The reversal of 899778 is 877998.

It is not an unprimeable number, because it can be changed into a prime (899779) by changing a digit.

899778 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 6751 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (122706).

2⁸⁹⁹⁷⁷⁸ is an apocalyptic number.

899778 is an abundant number, since it is smaller than the sum of its proper divisors (1063518).

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

899778 is a wasteful number, since it uses less digits than its factorization.

899778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13649.

The product of its digits is 254016, while the sum is 48.

The square root of 899778 is about 948.5662865609. The cubic root of 899778 is about 96.5409993395.

The spelling of 899778 in words is "eight hundred ninety-nine thousand, seven hundred seventy-eight".