400406173193 has 12 divisors (see below), whose sum is σ = 433771538508. Its totient is φ = 369438937920.

The previous prime is 400406173169. The next prime is 400406173199. The reversal of 400406173193 is 391371604004.

It can be written as a sum of positive squares in 6 ways, for example, as 58231481344 + 342174691849 = 241312^2 + 584957^2 .

It is not a de Polignac number, because 400406173193 - 2²⁶ = 400339064329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400406173199) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 158030 + ... + 908727.

It is an arithmetic number, because the mean of its divisors is an integer number (36147628209).

Almost surely, 2^400406173193 is an apocalyptic number.

It is an amenable number.

400406173193 is a deficient number, since it is larger than the sum of its proper divisors (33365365315).

400406173193 is a wasteful number, since it uses less digits than its factorization.

400406173193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069004 (or 1068991 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

Adding to 400406173193 its reverse (391371604004), we get a palindrome (791777777197).

The spelling of 400406173193 in words is "four hundred billion, four hundred six million, one hundred seventy-three thousand, one hundred ninety-three".