401395809 has 4 divisors (see below), whose sum is σ = 535194416. Its totient is φ = 267597204.

The previous prime is 401395801. The next prime is 401395837. The reversal of 401395809 is 908593104.

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 not a de Polignac number, because 401395809 - 2³ = 401395801 is a prime.

It is a super-2 number, since 2×401395809² = 322237190965528962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401395801) 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, 66899299 + ... + 66899304.

It is an arithmetic number, because the mean of its divisors is an integer number (133798604).

Almost surely, 2^401395809 is an apocalyptic number.

It is an amenable number.

401395809 is a deficient number, since it is larger than the sum of its proper divisors (133798607).

401395809 is a wasteful number, since it uses less digits than its factorization.

401395809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133798606.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 401395809 is about 20034.8648360801. The cubic root of 401395809 is about 737.6623388300.

It can be divided in two parts, 401395 and 809, that added together give a palindrome (402204).

The spelling of 401395809 in words is "four hundred one million, three hundred ninety-five thousand, eight hundred nine".