1228391424 has 132 divisors (see below), whose sum is σ = 3820168716. Its totient is φ = 377929728.

The previous prime is 1228391347. The next prime is 1228391471. The reversal of 1228391424 is 4241938221.

1228391424 is a `hidden beast` number, since 1 + 228 + 3 + 9 + 1 + 424 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 163021824 + 1065369600 = 12768^2 + 32640^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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, 114682 + ... + 124934.

Almost surely, 2^1228391424 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 1228391424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1910084358).

1228391424 is an abundant number, since it is smaller than the sum of its proper divisors (2591777292).

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

1228391424 is a wasteful number, since it uses less digits than its factorization.

1228391424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10292 (or 10271 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1228391424 is about 35048.4154278050. The cubic root of 1228391424 is about 1070.9739941952.

The spelling of 1228391424 in words is "one billion, two hundred twenty-eight million, three hundred ninety-one thousand, four hundred twenty-four".