400252345240 has 128 divisors (see below), whose sum is σ = 1025490585600. Its totient is φ = 139172267520.

The previous prime is 400252345223. The next prime is 400252345249. The reversal of 400252345240 is 42543252004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400252345249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48399826 + ... + 48408094.

It is an arithmetic number, because the mean of its divisors is an integer number (8011645200).

Almost surely, 2^400252345240 is an apocalyptic number.

400252345240 is a gapful number since it is divisible by the number (40) 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 400252345240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512745292800).

400252345240 is an abundant number, since it is smaller than the sum of its proper divisors (625238240360).

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

400252345240 is a wasteful number, since it uses less digits than its factorization.

400252345240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13097 (or 13093 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 400252345240 its reverse (42543252004), we get a palindrome (442795597244).

The spelling of 400252345240 in words is "four hundred billion, two hundred fifty-two million, three hundred forty-five thousand, two hundred forty".