1661044 has 24 divisors (see below), whose sum is σ = 3624768. Its totient is φ = 647040.

The previous prime is 1661029. The next prime is 1661059. The reversal of 1661044 is 4401661.

It is an interprime number because it is at equal distance from previous prime (1661029) and next prime (1661059).

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 2389 + ... + 3004.

It is an arithmetic number, because the mean of its divisors is an integer number (151032).

2^1661044 is an apocalyptic number.

1661044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1661044 is an abundant number, since it is smaller than the sum of its proper divisors (1963724).

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

1661044 is a wasteful number, since it uses less digits than its factorization.

1661044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415 (or 5413 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1661044 is about 1288.8149595656. The cubic root of 1661044 is about 118.4296317666.

The spelling of 1661044 in words is "one million, six hundred sixty-one thousand, forty-four".