1421628 has 36 divisors (see below), whose sum is σ = 3597048. Its totient is φ = 436800.

The previous prime is 1421627. The next prime is 1421639. The reversal of 1421628 is 8261241.

It is a junction number, because it is equal to n+sod(n) for n = 1421598 and 1421607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421621) 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 11 ways as a sum of consecutive naturals, for example, 1678 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (99918).

2^1421628 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 1421628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798524).

1421628 is an abundant number, since it is smaller than the sum of its proper divisors (2175420).

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

1421628 is a wasteful number, since it uses less digits than its factorization.

1421628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 719 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 1421628 is about 1192.3204267310. The cubic root of 1421628 is about 112.4420244491.

Adding to 1421628 its reverse (8261241), we get a palindrome (9682869).

It can be divided in two parts, 142 and 1628, that added together give a triangular number (1770 = T₅₉).

The spelling of 1421628 in words is "one million, four hundred twenty-one thousand, six hundred twenty-eight".