400275 has 24 divisors (see below), whose sum is σ = 736560. Its totient is φ = 213120.

The previous prime is 400261. The next prime is 400277. The reversal of 400275 is 572004.

It is a happy number.

It is not a de Polignac number, because 400275 - 2⁵ = 400243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379 + ... + 971.

It is an arithmetic number, because the mean of its divisors is an integer number (30690).

2⁴⁰⁰²⁷⁵ is an apocalyptic number.

400275 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400275 is a deficient number, since it is larger than the sum of its proper divisors (336285).

400275 is a wasteful number, since it uses less digits than its factorization.

400275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 400275 is about 632.6729012689. The cubic root of 400275 is about 73.6975112491.

Adding to 400275 its reverse (572004), we get a palindrome (972279).

The spelling of 400275 in words is "four hundred thousand, two hundred seventy-five".