400278 has 8 divisors (see below), whose sum is σ = 800568. Its totient is φ = 133424.

The previous prime is 400277. The next prime is 400291. The reversal of 400278 is 872004.

It is a happy number.

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

400278 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33351 + ... + 33362.

It is an arithmetic number, because the mean of its divisors is an integer number (100071).

2⁴⁰⁰²⁷⁸ is an apocalyptic number.

400278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400278 is a wasteful number, since it uses less digits than its factorization.

400278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66718.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 400278 is about 632.6752721578. The cubic root of 400278 is about 73.6976953659.

The spelling of 400278 in words is "four hundred thousand, two hundred seventy-eight".