1421816 has 32 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 636000.

The previous prime is 1421813. The next prime is 1421857. The reversal of 1421816 is 6181241.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1421791 and 1421800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9341 + ... + 9491.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^1421816 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 1421816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477440).

1421816 is an abundant number, since it is smaller than the sum of its proper divisors (1533064).

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

1421816 is a wasteful number, since it uses less digits than its factorization.

1421816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 271 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 1421816 is about 1192.3992619924. The cubic root of 1421816 is about 112.4469807782.

The spelling of 1421816 in words is "one million, four hundred twenty-one thousand, eight hundred sixteen".