1234423440 has 60 divisors (see below), whose sum is σ = 4145607804. Its totient is φ = 329179392.

The previous prime is 1234423423. The next prime is 1234423447. The reversal of 1234423440 is 443244321.

It is a happy number.

1234423440 is a `hidden beast` number, since 1 + 234 + 423 + 4 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 281836944 + 952586496 = 16788^2 + 30864^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (1234423447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 856519 + ... + 857958.

Almost surely, 2^1234423440 is an apocalyptic number.

1234423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1234423440 is an abundant number, since it is smaller than the sum of its proper divisors (2911184364).

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

1234423440 is a wasteful number, since it uses less digits than its factorization.

1234423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714496 (or 1714487 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 1234423440 is about 35134.3626667683. The cubic root of 1234423440 is about 1072.7241385264.

Adding to 1234423440 its reverse (443244321), we get a palindrome (1677667761).

The spelling of 1234423440 in words is "one billion, two hundred thirty-four million, four hundred twenty-three thousand, four hundred forty".