1865354868 has 216 divisors, whose sum is σ = 5477185896. Its totient is φ = 531878400.

The previous prime is 1865354863. The next prime is 1865354879. The reversal of 1865354868 is 8684535681.

1865354868 is a `hidden beast` number, since 1 + 8 + 6 + 535 + 48 + 68 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 345290724 + 1520064144 = 18582^2 + 38988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865354863) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10305738 + ... + 10305918.

Almost surely, 2^1865354868 is an apocalyptic number.

1865354868 is a gapful number since it is divisible by the number (18) 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 1865354868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738592948).

1865354868 is an abundant number, since it is smaller than the sum of its proper divisors (3611831028).

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

1865354868 is a wasteful number, since it uses less digits than its factorization.

1865354868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 279 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The square root of 1865354868 is about 43189.7542016622. The cubic root of 1865354868 is about 1230.9880064814.

The spelling of 1865354868 in words is "one billion, eight hundred sixty-five million, three hundred fifty-four thousand, eight hundred sixty-eight".