1421656 has 32 divisors (see below), whose sum is σ = 2880000. Its totient is φ = 655776.

The previous prime is 1421647. The next prime is 1421663. The reversal of 1421656 is 6561241.

It is a super-2 number, since 2×1421656² = 4042211564672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1421656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7045 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (90000).

2^1421656 is an apocalyptic number.

It is an amenable number.

1421656 is an abundant number, since it is smaller than the sum of its proper divisors (1458344).

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

1421656 is a wasteful number, since it uses less digits than its factorization.

1421656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 267 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1421656 is about 1192.3321684833. The cubic root of 1421656 is about 112.4427626535.

Adding to 1421656 its reverse (6561241), we get a palindrome (7982897).

The spelling of 1421656 in words is "one million, four hundred twenty-one thousand, six hundred fifty-six".