400539 has 8 divisors (see below), whose sum is σ = 562240. Its totient is φ = 252936.

The previous prime is 400523. The next prime is 400559. The reversal of 400539 is 935004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400539 - 2⁴ = 400523 is a prime.

It is a Duffinian number.

400539 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (400559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3457 + ... + 3570.

It is an arithmetic number, because the mean of its divisors is an integer number (70280).

2⁴⁰⁰⁵³⁹ is an apocalyptic number.

400539 is a deficient number, since it is larger than the sum of its proper divisors (161701).

400539 is a wasteful number, since it uses less digits than its factorization.

400539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 400539 is about 632.8815054969. The cubic root of 400539 is about 73.7137100018.

It can be divided in two parts, 400 and 539, that added together give a palindrome (939).

The spelling of 400539 in words is "four hundred thousand, five hundred thirty-nine".