400172202778 has 16 divisors (see below), whose sum is σ = 602175600000. Its totient is φ = 199447863552.

The previous prime is 400172202767. The next prime is 400172202779. The reversal of 400172202778 is 877202271004.

It is a self number, because there is not a number n which added to its sum of digits gives 400172202778.

It is not an unprimeable number, because it can be changed into a prime (400172202779) 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, 718573 + ... + 1147471.

It is an arithmetic number, because the mean of its divisors is an integer number (37635975000).

Almost surely, 2^400172202778 is an apocalyptic number.

400172202778 is a deficient number, since it is larger than the sum of its proper divisors (202003397222).

400172202778 is a wasteful number, since it uses less digits than its factorization.

400172202778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430389.

The product of its (nonzero) digits is 87808, while the sum is 40.

The spelling of 400172202778 in words is "four hundred billion, one hundred seventy-two million, two hundred two thousand, seven hundred seventy-eight".