5181990 has 64 divisors (see below), whose sum is σ = 13934592. Its totient is φ = 1222400.

The previous prime is 5181989. The next prime is 5181997. The reversal of 5181990 is 991815.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13339 + ... + 13721.

It is an arithmetic number, because the mean of its divisors is an integer number (217728).

Almost surely, 2^5181990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5181990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6967296).

5181990 is an abundant number, since it is smaller than the sum of its proper divisors (8752602).

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

5181990 is a wasteful number, since it uses less digits than its factorization.

5181990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 5181990 is about 2276.3984712699. The cubic root of 5181990 is about 173.0475773228.

The spelling of 5181990 in words is "five million, one hundred eighty-one thousand, nine hundred ninety".