1421406 has 48 divisors (see below), whose sum is σ = 3650400. Its totient is φ = 391104.

The previous prime is 1421401. The next prime is 1421417. The reversal of 1421406 is 6041241.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421401) 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 23 ways as a sum of consecutive naturals, for example, 3460 + ... + 3848.

It is an arithmetic number, because the mean of its divisors is an integer number (76050).

2^1421406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825200).

1421406 is an abundant number, since it is smaller than the sum of its proper divisors (2228994).

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

1421406 is a wasteful number, since it uses less digits than its factorization.

1421406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1421406 is about 1192.2273273164. The cubic root of 1421406 is about 112.4361711999.

Adding to 1421406 its reverse (6041241), we get a palindrome (7462647).

The spelling of 1421406 in words is "one million, four hundred twenty-one thousand, four hundred six".