400438 has 8 divisors (see below), whose sum is σ = 603432. Its totient is φ = 199296.

The previous prime is 400429. The next prime is 400441. The reversal of 400438 is 834004.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406 + ... + 982.

It is an arithmetic number, because the mean of its divisors is an integer number (75429).

2⁴⁰⁰⁴³⁸ is an apocalyptic number.

400438 is a deficient number, since it is larger than the sum of its proper divisors (202994).

400438 is a wasteful number, since it uses less digits than its factorization.

400438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 400438 is about 632.8017066981. The cubic root of 400438 is about 73.7075135926.

It can be divided in two parts, 400 and 438, that added together give a palindrome (838).

The spelling of 400438 in words is "four hundred thousand, four hundred thirty-eight".