1655997 has 8 divisors (see below), whose sum is σ = 2523456. Its totient is φ = 946272.

The previous prime is 1655981. The next prime is 1655999. The reversal of 1655997 is 7995561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1655997 - 2⁴ = 1655981 is a prime.

1655997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39408 + ... + 39449.

It is an arithmetic number, because the mean of its divisors is an integer number (315432).

2^1655997 is an apocalyptic number.

It is an amenable number.

1655997 is a deficient number, since it is larger than the sum of its proper divisors (867459).

1655997 is an equidigital number, since it uses as much as digits as its factorization.

1655997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78867.

The product of its digits is 85050, while the sum is 42.

The square root of 1655997 is about 1286.8554697401. The cubic root of 1655997 is about 118.3095625510.

The spelling of 1655997 in words is "one million, six hundred fifty-five thousand, nine hundred ninety-seven".