400575 has 36 divisors (see below), whose sum is σ = 777480. Its totient is φ = 181440.

The previous prime is 400559. The next prime is 400579. The reversal of 400575 is 575004.

It is not a de Polignac number, because 400575 - 2⁴ = 400559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

400575 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400579) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3621 + ... + 3729.

2⁴⁰⁰⁵⁷⁵ is an apocalyptic number.

400575 is a deficient number, since it is larger than the sum of its proper divisors (376905).

400575 is a wasteful number, since it uses less digits than its factorization.

400575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 400575 is about 632.9099462009. The cubic root of 400575 is about 73.7159183710.

Adding to 400575 its reverse (575004), we get a palindrome (975579).

The spelling of 400575 in words is "four hundred thousand, five hundred seventy-five".