1894123728 has 120 divisors (see below), whose sum is σ = 6161064000. Its totient is φ = 531988992.

The previous prime is 1894123711. The next prime is 1894123747. The reversal of 1894123728 is 8273214981.

It is a happy number.

1894123728 is a `hidden beast` number, since 189 + 412 + 37 + 28 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 43548 + ... + 75396.

It is an arithmetic number, because the mean of its divisors is an integer number (51342200).

Almost surely, 2^1894123728 is an apocalyptic number.

1894123728 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 1894123728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3080532000).

1894123728 is an abundant number, since it is smaller than the sum of its proper divisors (4266940272).

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

1894123728 is a wasteful number, since it uses less digits than its factorization.

1894123728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31929 (or 31920 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1894123728 is about 43521.5317745136. The cubic root of 1894123728 is about 1237.2841462510.

The spelling of 1894123728 in words is "one billion, eight hundred ninety-four million, one hundred twenty-three thousand, seven hundred twenty-eight".