400000123242040 has 64 divisors (see below), whose sum is σ = 907249217616000. Its totient is φ = 158713314814080.

The previous prime is 400000123241989. The next prime is 400000123242043. The reversal of 400000123242040 is 40242321000004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400000123242043) 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, 24207630 + ... + 37229149.

It is an arithmetic number, because the mean of its divisors is an integer number (14175769025250).

Almost surely, 2^{400000123242040} is an apocalyptic number.

400000123242040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400000123242040 is an abundant number, since it is smaller than the sum of its proper divisors (507249094373960).

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

400000123242040 is a wasteful number, since it uses less digits than its factorization.

400000123242040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61438100 (or 61438096 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 400000123242040 its reverse (40242321000004), we get a palindrome (440242444242044).

The spelling of 400000123242040 in words is "four hundred trillion, one hundred twenty-three million, two hundred forty-two thousand, forty".