1661610 has 32 divisors (see below), whose sum is σ = 4036032. Its totient is φ = 437760.

The previous prime is 1661599. The next prime is 1661623. The reversal of 1661610 is 161661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2625 + ... + 3195.

It is an arithmetic number, because the mean of its divisors is an integer number (126126).

2^1661610 is an apocalyptic number.

1661610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661610 is an abundant number, since it is smaller than the sum of its proper divisors (2374422).

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

1661610 is a wasteful number, since it uses less digits than its factorization.

1661610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1661610 is about 1289.0345224237. The cubic root of 1661610 is about 118.4430818537.

The spelling of 1661610 in words is "one million, six hundred sixty-one thousand, six hundred ten".