400545 has 40 divisors (see below), whose sum is σ = 766656. Its totient is φ = 199584.

The previous prime is 400523. The next prime is 400559. The reversal of 400545 is 545004.

It is a happy number.

It is not a de Polignac number, because 400545 - 2⁶ = 400481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9294 + ... + 9336.

2⁴⁰⁰⁵⁴⁵ is an apocalyptic number.

400545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400545 is a deficient number, since it is larger than the sum of its proper divisors (366111).

400545 is a wasteful number, since it uses less digits than its factorization.

400545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 400545 is about 632.8862457030. The cubic root of 400545 is about 73.7140780725.

Adding to 400545 its reverse (545004), we get a palindrome (945549).

The spelling of 400545 in words is "four hundred thousand, five hundred forty-five".