400478 has 16 divisors (see below), whose sum is σ = 658896. Its totient is φ = 181440.

The previous prime is 400471. The next prime is 400481. The reversal of 400478 is 874004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400471) 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, 1793 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (41181).

2⁴⁰⁰⁴⁷⁸ is an apocalyptic number.

400478 is a deficient number, since it is larger than the sum of its proper divisors (258418).

400478 is a wasteful number, since it uses less digits than its factorization.

400478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 400478 is about 632.8333113862. The cubic root of 400478 is about 73.7099677406.

It can be divided in two parts, 400 and 478, that added together give a palindrome (878).

The spelling of 400478 in words is "four hundred thousand, four hundred seventy-eight".