1656427 has 2 divisors, whose sum is σ = 1656428. Its totient is φ = 1656426.

The previous prime is 1656383. The next prime is 1656491. The reversal of 1656427 is 7246561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1656427 - 2¹⁹ = 1132139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1656227) 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 as a sum of consecutive naturals, namely, 828213 + 828214.

It is an arithmetic number, because the mean of its divisors is an integer number (828214).

2^1656427 is an apocalyptic number.

1656427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656427 is an equidigital number, since it uses as much as digits as its factorization.

1656427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 1656427 is about 1287.0225328253. The cubic root of 1656427 is about 118.3198018427.

It can be divided in two parts, 165642 and 7, that added together give a square (165649 = 407²).

The spelling of 1656427 in words is "one million, six hundred fifty-six thousand, four hundred twenty-seven".