1856404021822 has 32 divisors (see below), whose sum is σ = 3286291852800. Its totient is φ = 769969978848.

The previous prime is 1856404021799. The next prime is 1856404021847. The reversal of 1856404021822 is 2281204046581.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14079922 + ... + 14211157.

It is an arithmetic number, because the mean of its divisors is an integer number (102696620400).

Almost surely, 2^{1856404021822} is an apocalyptic number.

1856404021822 is a deficient number, since it is larger than the sum of its proper divisors (1429887830978).

1856404021822 is a wasteful number, since it uses less digits than its factorization.

1856404021822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28291240.

The product of its (nonzero) digits is 245760, while the sum is 43.

The spelling of 1856404021822 in words is "one trillion, eight hundred fifty-six billion, four hundred four million, twenty-one thousand, eight hundred twenty-two".