1423656 has 80 divisors (see below), whose sum is σ = 4319700. Its totient is φ = 438048.

The previous prime is 1423637. The next prime is 1423663. The reversal of 1423656 is 6563241.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1423656 is a `hidden beast` number, since 1 + 4 + 2 + 3 + 656 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 443556 + 980100 = 666^2 + 990^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=78.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

Its product of digits (4320) is a multiple of the sum of its prime divisors (18).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 109506 + ... + 109518.

2^1423656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1423656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159850).

1423656 is an abundant number, since it is smaller than the sum of its proper divisors (2896044).

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

1423656 is an equidigital number, since it uses as much as digits as its factorization.

1423656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 18 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1423656 is about 1193.1705661807. The cubic root of 1423656 is about 112.4954664840.

Adding to 1423656 its reverse (6563241), we get a palindrome (7986897).

The spelling of 1423656 in words is "one million, four hundred twenty-three thousand, six hundred fifty-six".