400112122520 has 64 divisors (see below), whose sum is σ = 1024793130240. Its totient is φ = 139169430400.

The previous prime is 400112122511. The next prime is 400112122523. The reversal of 400112122520 is 25221211004.

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

It is a junction number, because it is equal to n+sod(n) for n = 400112122492 and 400112122501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400112122523) 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, 19758266 + ... + 19778505.

It is an arithmetic number, because the mean of its divisors is an integer number (16012392660).

Almost surely, 2^400112122520 is an apocalyptic number.

400112122520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400112122520 is an abundant number, since it is smaller than the sum of its proper divisors (624681007720).

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

400112122520 is a wasteful number, since it uses less digits than its factorization.

400112122520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39536816 (or 39536812 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 400112122520 its reverse (25221211004), we get a palindrome (425333333524).

The spelling of 400112122520 in words is "four hundred billion, one hundred twelve million, one hundred twenty-two thousand, five hundred twenty".