401808445 has 8 divisors (see below), whose sum is σ = 482322744. Its totient is φ = 321345024.

The previous prime is 401808439. The next prime is 401808461. The reversal of 401808445 is 544808104.

It can be written as a sum of positive squares in 4 ways, for example, as 14584761 + 387223684 = 3819^2 + 19678^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401808445 - 2¹⁹ = 401284157 is a prime.

It is a super-4 number, since 4×401808445⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401808445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7617 + ... + 29353.

It is an arithmetic number, because the mean of its divisors is an integer number (60290343).

Almost surely, 2^401808445 is an apocalyptic number.

It is an amenable number.

401808445 is a deficient number, since it is larger than the sum of its proper divisors (80514299).

401808445 is a wasteful number, since it uses less digits than its factorization.

401808445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25439.

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 401808445 is about 20045.1601390460. The cubic root of 401808445 is about 737.9150252360.

The spelling of 401808445 in words is "four hundred one million, eight hundred eight thousand, four hundred forty-five".