401569 has 4 divisors (see below), whose sum is σ = 458944. Its totient is φ = 344196.

The previous prime is 401567. The next prime is 401587. The reversal of 401569 is 965104.

401569 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401569 - 2¹ = 401567 is a prime.

It is a super-2 number, since 2×401569² = 322515323522, which contains 22 as substring.

It is a Duffinian number.

401569 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (401567) 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, 28677 + ... + 28690.

It is an arithmetic number, because the mean of its divisors is an integer number (114736).

2⁴⁰¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

401569 is a deficient number, since it is larger than the sum of its proper divisors (57375).

401569 is an equidigital number, since it uses as much as digits as its factorization.

401569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57374.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 401569 is about 633.6947214551. The cubic root of 401569 is about 73.7768417091.

The spelling of 401569 in words is "four hundred one thousand, five hundred sixty-nine".