1856798394 has 64 divisors (see below), whose sum is σ = 4157733888. Its totient is φ = 547948800.

The previous prime is 1856798393. The next prime is 1856798431. The reversal of 1856798394 is 4938976581.

It is not an unprimeable number, because it can be changed into a prime (1856798393) 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, 1228099 + ... + 1229609.

It is an arithmetic number, because the mean of its divisors is an integer number (64964592).

Almost surely, 2^1856798394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1856798394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2078866944).

1856798394 is an abundant number, since it is smaller than the sum of its proper divisors (2300935494).

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

1856798394 is a wasteful number, since it uses less digits than its factorization.

1856798394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003.

The product of its digits is 13063680, while the sum is 60.

The square root of 1856798394 is about 43090.5835885289. The cubic root of 1856798394 is about 1229.1029204813.

The spelling of 1856798394 in words is "one billion, eight hundred fifty-six million, seven hundred ninety-eight thousand, three hundred ninety-four".