1655980 has 12 divisors (see below), whose sum is σ = 3477600. Its totient is φ = 662384.

The previous prime is 1655963. The next prime is 1655981. The reversal of 1655980 is 895561.

It is not an unprimeable number, because it can be changed into a prime (1655981) 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, 41380 + ... + 41419.

It is an arithmetic number, because the mean of its divisors is an integer number (289800).

2^1655980 is an apocalyptic number.

1655980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655980 is an abundant number, since it is smaller than the sum of its proper divisors (1821620).

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

1655980 is a wasteful number, since it uses less digits than its factorization.

1655980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82808 (or 82806 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 1655980 is about 1286.8488644748. The cubic root of 1655980 is about 118.3091577053.

The spelling of 1655980 in words is "one million, six hundred fifty-five thousand, nine hundred eighty".