400043336672 has 96 divisors (see below), whose sum is σ = 920570112000. Its totient is φ = 171054543744.

The previous prime is 400043336663. The next prime is 400043336681. The reversal of 400043336672 is 276633340004.

It is an interprime number because it is at equal distance from previous prime (400043336663) and next prime (400043336681).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4776953 + ... + 4859975.

It is an arithmetic number, because the mean of its divisors is an integer number (9589272000).

Almost surely, 2^400043336672 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 400043336672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460285056000).

400043336672 is an abundant number, since it is smaller than the sum of its proper divisors (520526775328).

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

400043336672 is an equidigital number, since it uses as much as digits as its factorization.

400043336672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83493 (or 83471 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 38.

Adding to 400043336672 its reverse (276633340004), we get a palindrome (676676676676).

The spelling of 400043336672 in words is "four hundred billion, forty-three million, three hundred thirty-six thousand, six hundred seventy-two".