1661094 has 32 divisors (see below), whose sum is σ = 3888000. Its totient is φ = 524232.

The previous prime is 1661069. The next prime is 1661111. The reversal of 1661094 is 4901661.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217 + ... + 1835.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2^1661094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944000).

1661094 is an abundant number, since it is smaller than the sum of its proper divisors (2226906).

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

1661094 is a wasteful number, since it uses less digits than its factorization.

1661094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649 (or 1643 counting only the distinct ones).

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

The square root of 1661094 is about 1288.8343570840. The cubic root of 1661094 is about 118.4308200599.

The spelling of 1661094 in words is "one million, six hundred sixty-one thousand, ninety-four".