400011331 has 4 divisors (see below), whose sum is σ = 417403152. Its totient is φ = 382619512.

The previous prime is 400011323. The next prime is 400011347. The reversal of 400011331 is 133110004.

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 400011331 - 2³ = 400011323 is a prime.

It is a super-3 number, since 3×400011331³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400015331) 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, 8695876 + ... + 8695921.

It is an arithmetic number, because the mean of its divisors is an integer number (104350788).

Almost surely, 2^400011331 is an apocalyptic number.

400011331 is a deficient number, since it is larger than the sum of its proper divisors (17391821).

400011331 is a wasteful number, since it uses less digits than its factorization.

400011331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17391820.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 400011331 is about 20000.2832729939. The cubic root of 400011331 is about 736.8132569559.

Adding to 400011331 its reverse (133110004), we get a palindrome (533121335).

The spelling of 400011331 in words is "four hundred million, eleven thousand, three hundred thirty-one".