401243565 has 32 divisors (see below), whose sum is σ = 665625600. Its totient is φ = 206151680.

The previous prime is 401243519. The next prime is 401243567. The reversal of 401243565 is 565342104.

It is not a de Polignac number, because 401243565 - 2⁸ = 401243309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401243567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278116 + ... + 279554.

It is an arithmetic number, because the mean of its divisors is an integer number (20800800).

Almost surely, 2^401243565 is an apocalyptic number.

It is an amenable number.

401243565 is a deficient number, since it is larger than the sum of its proper divisors (264382035).

401243565 is a wasteful number, since it uses less digits than its factorization.

401243565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 401243565 is about 20031.0649991457. The cubic root of 401243565 is about 737.5690652547.

Adding to 401243565 its reverse (565342104), we get a palindrome (966585669).

The spelling of 401243565 in words is "four hundred one million, two hundred forty-three thousand, five hundred sixty-five".