4188990 has 64 divisors (see below), whose sum is σ = 11321856. Its totient is φ = 984192.

The previous prime is 4188973. The next prime is 4188991. The reversal of 4188990 is 998814.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4188991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8737 + ... + 9203.

It is an arithmetic number, because the mean of its divisors is an integer number (176904).

Almost surely, 2^4188990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4188990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5660928).

4188990 is an abundant number, since it is smaller than the sum of its proper divisors (7132866).

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

4188990 is a wasteful number, since it uses less digits than its factorization.

4188990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 4188990 is about 2046.7022255326. The cubic root of 4188990 is about 161.2017582988.

The spelling of 4188990 in words is "four million, one hundred eighty-eight thousand, nine hundred ninety".