1234123440 has 80 divisors (see below), whose sum is σ = 4173590016. Its totient is φ = 299180800.

The previous prime is 1234123433. The next prime is 1234123441. The reversal of 1234123440 is 443214321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1234123440.

It is not an unprimeable number, because it can be changed into a prime (1234123441) 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, 231096 + ... + 236375.

Almost surely, 2^1234123440 is an apocalyptic number.

1234123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1234123440 is an abundant number, since it is smaller than the sum of its proper divisors (2939466576).

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

1234123440 is a wasteful number, since it uses less digits than its factorization.

1234123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467498 (or 467492 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1234123440 is about 35130.0930827119. The cubic root of 1234123440 is about 1072.6372306619.

Adding to 1234123440 its reverse (443214321), we get a palindrome (1677337761).

The spelling of 1234123440 in words is "one billion, two hundred thirty-four million, one hundred twenty-three thousand, four hundred forty".