1655988 has 12 divisors (see below), whose sum is σ = 3864000. Its totient is φ = 551992.

The previous prime is 1655981. The next prime is 1655999. The reversal of 1655988 is 8895561.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1655988² = 5484592512288, which contains 22 as substring.

It is a congruent number.

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, 68988 + ... + 69011.

It is an arithmetic number, because the mean of its divisors is an integer number (322000).

2^1655988 is an apocalyptic number.

It is an amenable number.

1655988 is an abundant number, since it is smaller than the sum of its proper divisors (2208012).

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

1655988 is a wasteful number, since it uses less digits than its factorization.

1655988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138006 (or 138004 counting only the distinct ones).

The product of its digits is 86400, while the sum is 42.

The square root of 1655988 is about 1286.8519728391. The cubic root of 1655988 is about 118.3093482213.

The spelling of 1655988 in words is "one million, six hundred fifty-five thousand, nine hundred eighty-eight".