2187225990 has 112 divisors (see below), whose sum is σ = 5936668848. Its totient is φ = 579918528.

The previous prime is 2187225959. The next prime is 2187226037. The reversal of 2187225990 is 995227812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1435369 + ... + 1436891.

Almost surely, 2^2187225990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2187225990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2968334424).

2187225990 is an abundant number, since it is smaller than the sum of its proper divisors (3749442858).

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

2187225990 is a wasteful number, since it uses less digits than its factorization.

2187225990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2187225990 is about 46767.7879528207. The cubic root of 2187225990 is about 1298.0693214734.

The spelling of 2187225990 in words is "two billion, one hundred eighty-seven million, two hundred twenty-five thousand, nine hundred ninety".