1421428 has 24 divisors (see below), whose sum is σ = 2671200. Its totient is φ = 659808.

The previous prime is 1421417. The next prime is 1421437. The reversal of 1421428 is 8241241.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1421399 and 1421408.

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, 4326 + ... + 4642.

It is an arithmetic number, because the mean of its divisors is an integer number (111300).

2^1421428 is an apocalyptic number.

It is an amenable number.

1421428 is a deficient number, since it is larger than the sum of its proper divisors (1249772).

1421428 is a wasteful number, since it uses less digits than its factorization.

1421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 397 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 1421428 is about 1192.2365537090. The cubic root of 1421428 is about 112.4367512788.

Adding to 1421428 its reverse (8241241), we get a palindrome (9662669).

It can be divided in two parts, 1421 and 428, that added together give a square (1849 = 43²).

The spelling of 1421428 in words is "one million, four hundred twenty-one thousand, four hundred twenty-eight".