1881864000 has 336 divisors, whose sum is σ = 6861291840. Its totient is φ = 492211200.

The previous prime is 1881863957. The next prime is 1881864001. The reversal of 1881864000 is 4681881.

1881864000 is a `hidden beast` number, since 1 + 8 + 8 + 1 + 8 + 640 + 0 + 0 = 666.

It is a super-2 number, since 2×1881864000² = 7082824228992000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881864001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4247779 + ... + 4248221.

Almost surely, 2^1881864000 is an apocalyptic number.

1881864000 is a gapful number since it is divisible by the number (10) 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 1881864000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3430645920).

1881864000 is an abundant number, since it is smaller than the sum of its proper divisors (4979427840).

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

1881864000 is a wasteful number, since it uses less digits than its factorization.

1881864000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1881864000 is about 43380.4564291341. The cubic root of 1881864000 is about 1234.6089229266.

The spelling of 1881864000 in words is "one billion, eight hundred eighty-one million, eight hundred sixty-four thousand".