1656897 has 32 divisors (see below), whose sum is σ = 2626560. Its totient is φ = 918720.

The previous prime is 1656887. The next prime is 1656899. The reversal of 1656897 is 7986561.

It is not a de Polignac number, because 1656897 - 2¹⁰ = 1655873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1656899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28054 + ... + 28112.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1656897 is an apocalyptic number.

It is an amenable number.

1656897 is a deficient number, since it is larger than the sum of its proper divisors (969663).

1656897 is a wasteful number, since it uses less digits than its factorization.

1656897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133.

The product of its digits is 90720, while the sum is 42.

The square root of 1656897 is about 1287.2051118606. The cubic root of 1656897 is about 118.3309915999.

The spelling of 1656897 in words is "one million, six hundred fifty-six thousand, eight hundred ninety-seven".