400877878 has 4 divisors (see below), whose sum is σ = 601316820. Its totient is φ = 200438938.

The previous prime is 400877843. The next prime is 400877881. The reversal of 400877878 is 878778004.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100219468 + ... + 100219471.

It is an arithmetic number, because the mean of its divisors is an integer number (150329205).

Almost surely, 2^400877878 is an apocalyptic number.

400877878 is a deficient number, since it is larger than the sum of its proper divisors (200438942).

400877878 is a wasteful number, since it uses less digits than its factorization.

400877878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200438941.

The product of its (nonzero) digits is 702464, while the sum is 49.

The square root of 400877878 is about 20021.9349214805. The cubic root of 400877878 is about 737.3449275794.

The spelling of 400877878 in words is "four hundred million, eight hundred seventy-seven thousand, eight hundred seventy-eight".