1655920 has 40 divisors (see below), whose sum is σ = 4401504. Its totient is φ = 567552.

The previous prime is 1655909. The next prime is 1655921. The reversal of 1655920 is 295561.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919 + ... + 2038.

2^1655920 is an apocalyptic number.

1655920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655920 is an abundant number, since it is smaller than the sum of its proper divisors (2745584).

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

1655920 is a wasteful number, since it uses less digits than its factorization.

1655920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2971 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1655920 is about 1286.8255515026. The cubic root of 1655920 is about 118.3077288162.

The spelling of 1655920 in words is "one million, six hundred fifty-five thousand, nine hundred twenty".