1231428 has 48 divisors (see below), whose sum is σ = 3306240. Its totient is φ = 352800.

The previous prime is 1231423. The next prime is 1231453. The reversal of 1231428 is 8241321.

It is not an unprimeable number, because it can be changed into a prime (1231421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2263 + ... + 2753.

It is an arithmetic number, because the mean of its divisors is an integer number (68880).

2^1231428 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 1231428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653120).

1231428 is an abundant number, since it is smaller than the sum of its proper divisors (2074812).

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

1231428 is a wasteful number, since it uses less digits than its factorization.

1231428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 526 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1231428 is about 1109.6972560117. The cubic root of 1231428 is about 107.1855748393.

Adding to 1231428 its reverse (8241321), we get a palindrome (9472749).

It can be divided in two parts, 123 and 1428, that added together give a palindrome (1551).

The spelling of 1231428 in words is "one million, two hundred thirty-one thousand, four hundred twenty-eight".