899019840 has 224 divisors, whose sum is σ = 3121542144. Its totient is φ = 218234880.

The previous prime is 899019839. The next prime is 899019841. The reversal of 899019840 is 48910998.

It is an interprime number because it is at equal distance from previous prime (899019839) and next prime (899019841).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 899019840.

It is not an unprimeable number, because it can be changed into a prime (899019841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505032 + ... + 506808.

It is an arithmetic number, because the mean of its divisors is an integer number (13935456).

Almost surely, 2^899019840 is an apocalyptic number.

899019840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 899019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560771072).

899019840 is an abundant number, since it is smaller than the sum of its proper divisors (2222522304).

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

899019840 is a wasteful number, since it uses less digits than its factorization.

899019840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 899019840 is about 29983.6595498281. The cubic root of 899019840 is about 965.1387631895.

The spelling of 899019840 in words is "eight hundred ninety-nine million, nineteen thousand, eight hundred forty".