400490 has 16 divisors (see below), whose sum is σ = 746280. Its totient is φ = 154560.

The previous prime is 400481. The next prime is 400523. The reversal of 400490 is 94004.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 83521 = 563^2 + 289^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400490.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401 + ... + 980.

2⁴⁰⁰⁴⁹⁰ is an apocalyptic number.

400490 is a deficient number, since it is larger than the sum of its proper divisors (345790).

400490 is a wasteful number, since it uses less digits than its factorization.

400490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 400490 is about 632.8427924848. The cubic root of 400490 is about 73.7107039532.

Adding to 400490 its reverse (94004), we get a palindrome (494494).

The spelling of 400490 in words is "four hundred thousand, four hundred ninety".