1641660 has 24 divisors (see below), whose sum is σ = 4596816. Its totient is φ = 437760.

The previous prime is 1641659. The next prime is 1641709. The reversal of 1641660 is 661461.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641660.

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, 13621 + ... + 13740.

It is an arithmetic number, because the mean of its divisors is an integer number (191534).

2^1641660 is an apocalyptic number.

1641660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641660 is an abundant number, since it is smaller than the sum of its proper divisors (2955156).

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

1641660 is a wasteful number, since it uses less digits than its factorization.

1641660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27373 (or 27371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1641660 is about 1281.2728046751. The cubic root of 1641660 is about 117.9671458855.

The spelling of 1641660 in words is "one million, six hundred forty-one thousand, six hundred sixty".