400340255816 has 8 divisors (see below), whose sum is σ = 750637979670. Its totient is φ = 200170127904.

The previous prime is 400340255813. The next prime is 400340255827. The reversal of 400340255816 is 618552043004.

It can be written as a sum of positive squares in only one way, i.e., 399987942916 + 352312900 = 632446^2 + 18770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 400340255816.

It is not an unprimeable number, because it can be changed into a prime (400340255813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25021265981 + ... + 25021265996.

Almost surely, 2^400340255816 is an apocalyptic number.

It is an amenable number.

400340255816 is a deficient number, since it is larger than the sum of its proper divisors (350297723854).

400340255816 is a wasteful number, since it uses less digits than its factorization.

400340255816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50042531983 (or 50042531979 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 400340255816 in words is "four hundred billion, three hundred forty million, two hundred fifty-five thousand, eight hundred sixteen".