123031002440 has 64 divisors (see below), whose sum is σ = 286645273200. Its totient is φ = 47468961792.

The previous prime is 123031002439. The next prime is 123031002443. The reversal of 123031002440 is 44200130321.

123031002440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 105928117156 + 17102885284 = 325466^2 + 130778^2 .

It is a super-2 number, since 2×123031002440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (123031002443) 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, 1146944 + ... + 1249616.

Almost surely, 2^123031002440 is an apocalyptic number.

123031002440 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 123031002440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143322636600).

123031002440 is an abundant number, since it is smaller than the sum of its proper divisors (163614270760).

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

123031002440 is a wasteful number, since it uses less digits than its factorization.

123031002440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103746 (or 103742 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 123031002440 its reverse (44200130321), we get a palindrome (167231132761).

The spelling of 123031002440 in words is "one hundred twenty-three billion, thirty-one million, two thousand, four hundred forty".