400240125405520 has 80 divisors (see below), whose sum is σ = 985642621138368. Its totient is φ = 150625782835200.

The previous prime is 400240125405509. The next prime is 400240125405539. The reversal of 400240125405520 is 25504521042004.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-4 number, since 4×400240125405520⁴ (a number of 60 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47735094 + ... + 55489813.

Almost surely, 2^{400240125405520} is an apocalyptic number.

400240125405520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400240125405520 is an abundant number, since it is smaller than the sum of its proper divisors (585402495732848).

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

400240125405520 is a wasteful number, since it uses less digits than its factorization.

400240125405520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103227788 (or 103227782 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 34.

Adding to 400240125405520 its reverse (25504521042004), we get a palindrome (425744646447524).

The spelling of 400240125405520 in words is "four hundred trillion, two hundred forty billion, one hundred twenty-five million, four hundred five thousand, five hundred twenty".