1420656 has 40 divisors (see below), whose sum is σ = 3888144. Its totient is φ = 445440.

The previous prime is 1420651. The next prime is 1420667. The reversal of 1420656 is 6560241.

1420656 = 195² + 196² + ... + 226².

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420651) 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, 55 + ... + 1686.

2^1420656 is an apocalyptic number.

1420656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944072).

1420656 is an abundant number, since it is smaller than the sum of its proper divisors (2467488).

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

1420656 is a wasteful number, since it uses less digits than its factorization.

1420656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1763 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1420656 is about 1191.9127484846. The cubic root of 1420656 is about 112.4163922007.

Adding to 1420656 its reverse (6560241), we get a palindrome (7980897).

The spelling of 1420656 in words is "one million, four hundred twenty thousand, six hundred fifty-six".