400878289 has 8 divisors (see below), whose sum is σ = 458267840. Its totient is φ = 343519056.

The previous prime is 400878277. The next prime is 400878299. The reversal of 400878289 is 982878004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400878289 - 2¹⁵ = 400845521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400878299) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 46567 + ... + 54499.

It is an arithmetic number, because the mean of its divisors is an integer number (57283480).

Almost surely, 2^400878289 is an apocalyptic number.

It is an amenable number.

400878289 is a deficient number, since it is larger than the sum of its proper divisors (57389551).

400878289 is an equidigital number, since it uses as much as digits as its factorization.

400878289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15159.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 400878289 is about 20021.9451852211. The cubic root of 400878289 is about 737.3451795669.

The spelling of 400878289 in words is "four hundred million, eight hundred seventy-eight thousand, two hundred eighty-nine".