400143312 has 60 divisors (see below), whose sum is σ = 1121415204. Its totient is φ = 133194240.

The previous prime is 400143311. The next prime is 400143329. The reversal of 400143312 is 213341004.

It can be written as a sum of positive squares in 2 ways, for example, as 289136016 + 111007296 = 17004^2 + 10536^2 .

It is a super-2 number, since 2×400143312² = 320229340276658688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400143311) 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, 134028 + ... + 136980.

Almost surely, 2^400143312 is an apocalyptic number.

It is an amenable number.

400143312 is an abundant number, since it is smaller than the sum of its proper divisors (721271892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400143312 is a wasteful number, since it uses less digits than its factorization.

400143312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400143312 is about 20003.5824791461. The cubic root of 400143312 is about 736.8942835417.

Adding to 400143312 its reverse (213341004), we get a palindrome (613484316).

The spelling of 400143312 in words is "four hundred million, one hundred forty-three thousand, three hundred twelve".