1866227904 has 336 divisors, whose sum is σ = 6044854560. Its totient is φ = 564019200.

The previous prime is 1866227893. The next prime is 1866227927. The reversal of 1866227904 is 4097226681.

It is a happy number.

1866227904 is a `hidden beast` number, since 18 + 6 + 622 + 7 + 9 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1866227904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18477454 + ... + 18477554.

Almost surely, 2^1866227904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866227904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3022427280).

1866227904 is an abundant number, since it is smaller than the sum of its proper divisors (4178626656).

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

1866227904 is a wasteful number, since it uses less digits than its factorization.

1866227904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1866227904 is about 43199.8599997731. The cubic root of 1866227904 is about 1231.1800216389.

The spelling of 1866227904 in words is "one billion, eight hundred sixty-six million, two hundred twenty-seven thousand, nine hundred four".