12423043440 has 160 divisors (see below), whose sum is σ = 42943799040. Its totient is φ = 3300943104.

The previous prime is 12423043433. The next prime is 12423043469. The reversal of 12423043440 is 4434032421.

It is a happy number.

12423043440 is a `hidden beast` number, since 12 + 4 + 2 + 304 + 344 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601119 + ... + 621441.

It is an arithmetic number, because the mean of its divisors is an integer number (268398744).

Almost surely, 2^12423043440 is an apocalyptic number.

12423043440 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 12423043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21471899520).

12423043440 is an abundant number, since it is smaller than the sum of its proper divisors (30520755600).

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

12423043440 is a wasteful number, since it uses less digits than its factorization.

12423043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20628 (or 20616 counting only the distinct ones).

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

Adding to 12423043440 its reverse (4434032421), we get a palindrome (16857075861).

The spelling of 12423043440 in words is "twelve billion, four hundred twenty-three million, forty-three thousand, four hundred forty".