400021726556 has 6 divisors (see below), whose sum is σ = 700038021480. Its totient is φ = 200010863276.

The previous prime is 400021726543. The next prime is 400021726579. The reversal of 400021726556 is 655627120004.

It is a super-2 number, since 2×400021726556² (a number of 24 digits) contains 22 as substring.

It is a congruent 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 as a sum of consecutive naturals, namely, 50002715816 + ... + 50002715823.

It is an arithmetic number, because the mean of its divisors is an integer number (116673003580).

Almost surely, 2^400021726556 is an apocalyptic number.

It is an amenable number.

400021726556 is a deficient number, since it is larger than the sum of its proper divisors (300016294924).

400021726556 is a wasteful number, since it uses less digits than its factorization.

400021726556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100005431643 (or 100005431641 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 400021726556 in words is "four hundred billion, twenty-one million, seven hundred twenty-six thousand, five hundred fifty-six".