400345 has 16 divisors (see below), whose sum is σ = 544320. Its totient is φ = 280000.

The previous prime is 400339. The next prime is 400381. The reversal of 400345 is 543004.

It is not a de Polignac number, because 400345 - 2⁵ = 400313 is a prime.

It is a super-2 number, since 2×400345² = 320552238050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁴⁰⁰³⁴⁵ is an apocalyptic number.

It is an amenable number.

400345 is a deficient number, since it is larger than the sum of its proper divisors (143975).

400345 is a wasteful number, since it uses less digits than its factorization.

400345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400345 is about 632.7282196963. The cubic root of 400345 is about 73.7018070667.

Adding to 400345 its reverse (543004), we get a palindrome (943349).

The spelling of 400345 in words is "four hundred thousand, three hundred forty-five".