400243434324020 has 96 divisors (see below), whose sum is σ = 974541598356480. Its totient is φ = 135238833999360.

The previous prime is 400243434323917. The next prime is 400243434324049. The reversal of 400243434324020 is 20423434342004.

It is a super-2 number, since 2×400243434324020² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27462359 + ... + 39429278.

It is an arithmetic number, because the mean of its divisors is an integer number (10151474982880).

Almost surely, 2^{400243434324020} is an apocalyptic number.

It is an amenable number.

400243434324020 is an abundant number, since it is smaller than the sum of its proper divisors (574298164032460).

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

400243434324020 is a wasteful number, since it uses less digits than its factorization.

400243434324020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66892273 (or 66892271 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 35.

Adding to 400243434324020 its reverse (20423434342004), we get a palindrome (420666868666024).

The spelling of 400243434324020 in words is "four hundred trillion, two hundred forty-three billion, four hundred thirty-four million, three hundred twenty-four thousand, twenty".