1234534420 has 72 divisors (see below), whose sum is σ = 3029511240. Its totient is φ = 421344000.

The previous prime is 1234534417. The next prime is 1234534471. The reversal of 1234534420 is 244354321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 766071684 + 468462736 = 27678^2 + 21644^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221670 + ... + 227170.

It is an arithmetic number, because the mean of its divisors is an integer number (42076545).

Almost surely, 2^1234534420 is an apocalyptic number.

1234534420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1234534420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514755620).

1234534420 is an abundant number, since it is smaller than the sum of its proper divisors (1794976820).

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

1234534420 is a wasteful number, since it uses less digits than its factorization.

1234534420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5753 (or 5744 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 1234534420 is about 35135.9419967645. The cubic root of 1234534420 is about 1072.7562850745.

Adding to 1234534420 its reverse (244354321), we get a palindrome (1478888741).

The spelling of 1234534420 in words is "one billion, two hundred thirty-four million, five hundred thirty-four thousand, four hundred twenty".