2181900528 has 90 divisors (see below), whose sum is σ = 6310022472. Its totient is φ = 703794240.

The previous prime is 2181900517. The next prime is 2181900557. The reversal of 2181900528 is 8250091812.

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

It is a junction number, because it is equal to n+sod(n) for n = 2181900492 and 2181900501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 130501 + ... + 146267.

Almost surely, 2^2181900528 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 2181900528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3155011236).

2181900528 is an abundant number, since it is smaller than the sum of its proper divisors (4128121944).

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

2181900528 is a wasteful number, since it uses less digits than its factorization.

2181900528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15843 (or 15803 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 2181900528 is about 46710.8181045890. The cubic root of 2181900528 is about 1297.0149513983.

The spelling of 2181900528 in words is "two billion, one hundred eighty-one million, nine hundred thousand, five hundred twenty-eight".