400404312311 has 4 divisors (see below), whose sum is σ = 400425551400. Its totient is φ = 400383073224.

The previous prime is 400404312307. The next prime is 400404312361. The reversal of 400404312311 is 113213404004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400404312311 - 2² = 400404312307 is a prime.

It is a super-2 number, since 2×400404312311² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400404312361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10591241 + ... + 10628978.

It is an arithmetic number, because the mean of its divisors is an integer number (100106387850).

Almost surely, 2^400404312311 is an apocalyptic number.

400404312311 is a deficient number, since it is larger than the sum of its proper divisors (21239089).

400404312311 is a wasteful number, since it uses less digits than its factorization.

400404312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21239088.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 400404312311 its reverse (113213404004), we get a palindrome (513617716315).

The spelling of 400404312311 in words is "four hundred billion, four hundred four million, three hundred twelve thousand, three hundred eleven".