400394 has 8 divisors (see below), whose sum is σ = 606528. Its totient is φ = 198220.

The previous prime is 400391. The next prime is 400409. The reversal of 400394 is 493004.

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

It is not an unprimeable number, because it can be changed into a prime (400391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (75816).

2⁴⁰⁰³⁹⁴ is an apocalyptic number.

400394 is a deficient number, since it is larger than the sum of its proper divisors (206134).

400394 is a wasteful number, since it uses less digits than its factorization.

400394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 400394 is about 632.7669397179. The cubic root of 400394 is about 73.7048138410.

Adding to 400394 its reverse (493004), we get a palindrome (893398).

The spelling of 400394 in words is "four hundred thousand, three hundred ninety-four".