400121130464 has 48 divisors (see below), whose sum is σ = 859402217520. Its totient is φ = 181862415360.

The previous prime is 400121130463. The next prime is 400121130481. The reversal of 400121130464 is 464031121004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121130463) 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, 10905302 + ... + 10941930.

It is an arithmetic number, because the mean of its divisors is an integer number (17904212865).

Almost surely, 2^400121130464 is an apocalyptic number.

400121130464 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400121130464 is an abundant number, since it is smaller than the sum of its proper divisors (459281087056).

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

400121130464 is a wasteful number, since it uses less digits than its factorization.

400121130464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67683 (or 67675 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 400121130464 its reverse (464031121004), we get a palindrome (864152251468).

The spelling of 400121130464 in words is "four hundred billion, one hundred twenty-one million, one hundred thirty thousand, four hundred sixty-four".