1661190 has 16 divisors (see below), whose sum is σ = 3986928. Its totient is φ = 442976.

The previous prime is 1661173. The next prime is 1661237. The reversal of 1661190 is 911661.

It is a super-2 number, since 2×1661190² = 5519104432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1661190.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27657 + ... + 27716.

It is an arithmetic number, because the mean of its divisors is an integer number (249183).

2^1661190 is an apocalyptic number.

1661190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661190 is an abundant number, since it is smaller than the sum of its proper divisors (2325738).

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

1661190 is a wasteful number, since it uses less digits than its factorization.

1661190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55383.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1661190 is about 1288.8715995009. The cubic root of 1661190 is about 118.4331015161.

The spelling of 1661190 in words is "one million, six hundred sixty-one thousand, one hundred ninety".