400866878 has 16 divisors (see below), whose sum is σ = 616430736. Its totient is φ = 195436800.

The previous prime is 400866877. The next prime is 400866887. The reversal of 400866878 is 878668004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400866877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5678 + ... + 28878.

It is an arithmetic number, because the mean of its divisors is an integer number (38526921).

Almost surely, 2^400866878 is an apocalyptic number.

400866878 is a deficient number, since it is larger than the sum of its proper divisors (215563858).

400866878 is a wasteful number, since it uses less digits than its factorization.

400866878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23419.

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 400866878 is about 20021.6602208708. The cubic root of 400866878 is about 737.3381833240.

It can be divided in two parts, 40086 and 6878, that added together give a palindrome (46964).

The spelling of 400866878 in words is "four hundred million, eight hundred sixty-six thousand, eight hundred seventy-eight".