1428 has 24 divisors (see below), whose sum is σ = 4032. Its totient is φ = 384.

The previous prime is 1427. The next prime is 1429. The reversal of 1428 is 8241.

It is an interprime number because it is at equal distance from previous prime (1427) and next prime (1429).

It is an Ulam number.

It is a nialpdrome in base 7, base 14 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 92.

It is an arithmetic number, because the mean of its divisors is an integer number (168).

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2016).

1428 is an abundant number, since it is smaller than the sum of its proper divisors (2604).

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

1428 is a wasteful number, since it uses less digits than its factorization.

1428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31 (or 29 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 1428 is about 37.7888872554. The cubic root of 1428 is about 11.2609769403.

Adding to 1428 its reverse (8241), we get a palindrome (9669).

The spelling of 1428 in words is "one thousand, four hundred twenty-eight".