401809563 has 24 divisors (see below), whose sum is σ = 613317120. Its totient is φ = 252972720.

The previous prime is 401809531. The next prime is 401809567. The reversal of 401809563 is 365908104.

It is not a de Polignac number, because 401809563 - 2⁵ = 401809531 is a prime.

It is a super-2 number, since 2×401809563² = 322901849836501938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401809567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4068 + ... + 28638.

It is an arithmetic number, because the mean of its divisors is an integer number (25554880).

Almost surely, 2^401809563 is an apocalyptic number.

401809563 is a deficient number, since it is larger than the sum of its proper divisors (211507557).

401809563 is a wasteful number, since it uses less digits than its factorization.

401809563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24679 (or 24676 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 401809563 is about 20045.1880260575. The cubic root of 401809563 is about 737.9157096320.

The spelling of 401809563 in words is "four hundred one million, eight hundred nine thousand, five hundred sixty-three".