6171990 has 64 divisors (see below), whose sum is σ = 16485120. Its totient is φ = 1466240.

The previous prime is 6171967. The next prime is 6172021. The reversal of 6171990 is 991716.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19312 + ... + 19628.

It is an arithmetic number, because the mean of its divisors is an integer number (257580).

Almost surely, 2^6171990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6171990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8242560).

6171990 is an abundant number, since it is smaller than the sum of its proper divisors (10313130).

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

6171990 is a wasteful number, since it uses less digits than its factorization.

6171990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 6171990 is about 2484.3490092980. The cubic root of 6171990 is about 183.4319873076.

The spelling of 6171990 in words is "six million, one hundred seventy-one thousand, nine hundred ninety".