858198240 has 144 divisors (see below), whose sum is σ = 3037205808. Its totient is φ = 228842496.

The previous prime is 858198221. The next prime is 858198259. The reversal of 858198240 is 42891858.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (858198221) and next prime (858198259).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27844 + ... + 49916.

It is an arithmetic number, because the mean of its divisors is an integer number (21091707).

Almost surely, 2^858198240 is an apocalyptic number.

858198240 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 858198240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518602904).

858198240 is an abundant number, since it is smaller than the sum of its proper divisors (2179007568).

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

858198240 is a wasteful number, since it uses less digits than its factorization.

858198240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22103 (or 22083 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 858198240 is about 29295.0207373198. The cubic root of 858198240 is about 950.3039618292.

The spelling of 858198240 in words is "eight hundred fifty-eight million, one hundred ninety-eight thousand, two hundred forty".