1894340864 has 36 divisors (see below), whose sum is σ = 4072156956. Its totient is φ = 874309632.

The previous prime is 1894340857. The next prime is 1894340867. The reversal of 1894340864 is 4680434981.

It can be written as a sum of positive squares in 2 ways, for example, as 262180864 + 1632160000 = 16192^2 + 40400^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894340867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281279 + ... + 287934.

It is an arithmetic number, because the mean of its divisors is an integer number (113115471).

Almost surely, 2^1894340864 is an apocalyptic number.

It is an amenable number.

1894340864 is an abundant number, since it is smaller than the sum of its proper divisors (2177816092).

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

1894340864 is an equidigital number, since it uses as much as digits as its factorization.

1894340864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569242 (or 569228 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 1894340864 is about 43524.0262843409. The cubic root of 1894340864 is about 1237.3314238146.

The spelling of 1894340864 in words is "one billion, eight hundred ninety-four million, three hundred forty thousand, eight hundred sixty-four".