400636019522 has 6 divisors (see below), whose sum is σ = 600955371993. Its totient is φ = 200317562192.

The previous prime is 400636019513. The next prime is 400636019551. The reversal of 400636019522 is 225910636004.

It can be written as a sum of positive squares in 2 ways, for example, as 324217498801 + 76418520721 = 569401^2 + 276439^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=447569.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 671354 + ... + 1118922.

Almost surely, 2^400636019522 is an apocalyptic number.

400636019522 is a deficient number, since it is larger than the sum of its proper divisors (200319352471).

400636019522 is an frugal number, since it uses more digits than its factorization.

400636019522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895140 (or 447571 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 400636019522 in words is "four hundred billion, six hundred thirty-six million, nineteen thousand, five hundred twenty-two".