400541 has 4 divisors (see below), whose sum is σ = 402300. Its totient is φ = 398784.

The previous prime is 400523. The next prime is 400559. The reversal of 400541 is 145004.

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

It is an interprime number because it is at equal distance from previous prime (400523) and next prime (400559).

It can be written as a sum of positive squares in 2 ways, for example, as 52441 + 348100 = 229^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 400541 - 2¹⁴ = 384157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400441) 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, 476 + ... + 1013.

It is an arithmetic number, because the mean of its divisors is an integer number (100575).

2⁴⁰⁰⁵⁴¹ is an apocalyptic number.

It is an amenable number.

400541 is a deficient number, since it is larger than the sum of its proper divisors (1759).

400541 is a wasteful number, since it uses less digits than its factorization.

400541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 400541 is about 632.8830855695. The cubic root of 400541 is about 73.7138326924.

Adding to 400541 its reverse (145004), we get a palindrome (545545).

The spelling of 400541 in words is "four hundred thousand, five hundred forty-one".