400340736738 has 64 divisors (see below), whose sum is σ = 893178864000. Its totient is φ = 132917982912.

The previous prime is 400340736737. The next prime is 400340736743. The reversal of 400340736738 is 837637043004.

It is a junction number, because it is equal to n+sod(n) for n = 400340736693 and 400340736702.

It is not an unprimeable number, because it can be changed into a prime (400340736737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15186373 + ... + 15212711.

It is an arithmetic number, because the mean of its divisors is an integer number (13955919750).

Almost surely, 2^400340736738 is an apocalyptic number.

400340736738 is an abundant number, since it is smaller than the sum of its proper divisors (492838127262).

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

400340736738 is a wasteful number, since it uses less digits than its factorization.

400340736738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27456 (or 27450 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 45.

The spelling of 400340736738 in words is "four hundred billion, three hundred forty million, seven hundred thirty-six thousand, seven hundred thirty-eight".