1664190 has 72 divisors (see below), whose sum is σ = 4838184. Its totient is φ = 393600.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664190 is 914661.

1664190 is a `hidden beast` number, since 16 + 641 + 9 + 0 = 666.

It is a super-2 number, since 2×1664190² = 5539056712200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40570 + ... + 40610.

It is an arithmetic number, because the mean of its divisors is an integer number (67197).

2^1664190 is an apocalyptic number.

1664190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419092).

1664190 is an abundant number, since it is smaller than the sum of its proper divisors (3173994).

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

1664190 is a wasteful number, since it uses less digits than its factorization.

1664190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1664190 is about 1290.0348832493. The cubic root of 1664190 is about 118.5043527750.

It can be divided in two parts, 166 and 4190, that added together give a square (4356 = 66²).

The spelling of 1664190 in words is "one million, six hundred sixty-four thousand, one hundred ninety".