400547 has 4 divisors (see below), whose sum is σ = 457776. Its totient is φ = 343320.

The previous prime is 400523. The next prime is 400559. The reversal of 400547 is 745004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400547 - 2⁸ = 400291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28604 + ... + 28617.

It is an arithmetic number, because the mean of its divisors is an integer number (114444).

2⁴⁰⁰⁵⁴⁷ is an apocalyptic number.

400547 is a deficient number, since it is larger than the sum of its proper divisors (57229).

400547 is an equidigital number, since it uses as much as digits as its factorization.

400547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57228.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 400547 is about 632.8878257638. The cubic root of 400547 is about 73.7142007619.

The spelling of 400547 in words is "four hundred thousand, five hundred forty-seven".