400021726554 has 80 divisors (see below), whose sum is σ = 908671357440. Its totient is φ = 131516978400.

The previous prime is 400021726543. The next prime is 400021726579. The reversal of 400021726554 is 455627120004.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4256727 + ... + 4349685.

It is an arithmetic number, because the mean of its divisors is an integer number (11358391968).

Almost surely, 2^400021726554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400021726554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454335678720).

400021726554 is an abundant number, since it is smaller than the sum of its proper divisors (508649630886).

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

400021726554 is a wasteful number, since it uses less digits than its factorization.

400021726554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93337 (or 93328 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

Adding to 400021726554 its reverse (455627120004), we get a palindrome (855648846558).

The spelling of 400021726554 in words is "four hundred billion, twenty-one million, seven hundred twenty-six thousand, five hundred fifty-four".