400343552 has 80 divisors (see below), whose sum is σ = 939195840. Its totient is φ = 166883328.

The previous prime is 400343551. The next prime is 400343569. The reversal of 400343552 is 255343004.

It is not an unprimeable number, because it can be changed into a prime (400343551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131099 + ... + 134117.

It is an arithmetic number, because the mean of its divisors is an integer number (11739948).

Almost surely, 2^400343552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400343552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469597920).

400343552 is an abundant number, since it is smaller than the sum of its proper divisors (538852288).

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

400343552 is an equidigital number, since it uses as much as digits as its factorization.

400343552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081 (or 3065 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 400343552 is about 20008.5869566044. The cubic root of 400343552 is about 737.0171820969.

Adding to 400343552 its reverse (255343004), we get a palindrome (655686556).

The spelling of 400343552 in words is "four hundred million, three hundred forty-three thousand, five hundred fifty-two".