1656442 has 4 divisors (see below), whose sum is σ = 2484666. Its totient is φ = 828220.

The previous prime is 1656427. The next prime is 1656491. The reversal of 1656442 is 2446561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2446561 = 13 ⋅188197.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 808201 = 921^2 + 899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1656442.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 414109 + ... + 414112.

2^1656442 is an apocalyptic number.

1656442 is a deficient number, since it is larger than the sum of its proper divisors (828224).

1656442 is an equidigital number, since it uses as much as digits as its factorization.

1656442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828223.

The product of its digits is 5760, while the sum is 28.

The square root of 1656442 is about 1287.0283602159. The cubic root of 1656442 is about 118.3201589953.

The spelling of 1656442 in words is "one million, six hundred fifty-six thousand, four hundred forty-two".