400043112 has 128 divisors (see below), whose sum is σ = 1184870400. Its totient is φ = 110170368.

The previous prime is 400043101. The next prime is 400043113. The reversal of 400043112 is 211340004.

It is a junction number, because it is equal to n+sod(n) for n = 400043091 and 400043100.

It is not an unprimeable number, because it can be changed into a prime (400043113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863793 + ... + 864255.

It is an arithmetic number, because the mean of its divisors is an integer number (9256800).

Almost surely, 2^400043112 is an apocalyptic number.

400043112 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400043112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592435200).

400043112 is an abundant number, since it is smaller than the sum of its proper divisors (784827288).

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

400043112 is a wasteful number, since it uses less digits than its factorization.

400043112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 400043112 is about 20001.0777709602. The cubic root of 400043112 is about 736.8327697714.

Adding to 400043112 its reverse (211340004), we get a palindrome (611383116).

The spelling of 400043112 in words is "four hundred million, forty-three thousand, one hundred twelve".