2187990 has 96 divisors (see below), whose sum is σ = 6829056. Its totient is φ = 475200.

The previous prime is 2187979. The next prime is 2188001. The reversal of 2187990 is 997812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2187979) and next prime (2188001).

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, 14415 + ... + 14565.

It is an arithmetic number, because the mean of its divisors is an integer number (71136).

2^2187990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2187990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3414528).

2187990 is an abundant number, since it is smaller than the sum of its proper divisors (4641066).

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

2187990 is a wasteful number, since it uses less digits than its factorization.

2187990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2187990 is about 1479.1855867335. The cubic root of 2187990 is about 129.8220444783.

The spelling of 2187990 in words is "two million, one hundred eighty-seven thousand, nine hundred ninety".