1212428 has 48 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 471744.

The previous prime is 1212427. The next prime is 1212433. The reversal of 1212428 is 8242121.

It is a happy number.

It is a d-powerful number, because it can be written as 1 + 2 + 1 + 2¹⁵ + 4¹⁰ + 2¹⁷ + 8 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212427) 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 15 ways as a sum of consecutive naturals, for example, 22850 + ... + 22902.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2^1212428 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 1212428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330560).

1212428 is an abundant number, since it is smaller than the sum of its proper divisors (1448692).

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

1212428 is a wasteful number, since it uses less digits than its factorization.

1212428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 124 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 1212428 is about 1101.1030832760. The cubic root of 1212428 is about 106.6314510486.

Adding to 1212428 its reverse (8242121), we get a palindrome (9454549).

The spelling of 1212428 in words is "one million, two hundred twelve thousand, four hundred twenty-eight".