1661588 has 12 divisors (see below), whose sum is σ = 3060960. Its totient is φ = 787032.

The previous prime is 1661587. The next prime is 1661599. The reversal of 1661588 is 8851661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10856 + ... + 11007.

It is an arithmetic number, because the mean of its divisors is an integer number (255080).

2^1661588 is an apocalyptic number.

It is an amenable number.

1661588 is a deficient number, since it is larger than the sum of its proper divisors (1399372).

1661588 is a wasteful number, since it uses less digits than its factorization.

1661588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21886 (or 21884 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 1661588 is about 1289.0259888769. The cubic root of 1661588 is about 118.4425591158.

The spelling of 1661588 in words is "one million, six hundred sixty-one thousand, five hundred eighty-eight".