400123746544 has 80 divisors (see below), whose sum is σ = 828520007040. Its totient is φ = 186904730880.

The previous prime is 400123746527. The next prime is 400123746557. The reversal of 400123746544 is 445647321004.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 400123746497 and 400123746506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1368699 + ... + 1635109.

It is an arithmetic number, because the mean of its divisors is an integer number (10356500088).

Almost surely, 2^400123746544 is an apocalyptic number.

It is an amenable number.

400123746544 is an abundant number, since it is smaller than the sum of its proper divisors (428396260496).

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

400123746544 is a wasteful number, since it uses less digits than its factorization.

400123746544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266558 (or 266552 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The spelling of 400123746544 in words is "four hundred billion, one hundred twenty-three million, seven hundred forty-six thousand, five hundred forty-four".