401809445 has 16 divisors (see below), whose sum is σ = 498408960. Its totient is φ = 310651200.

The previous prime is 401809427. The next prime is 401809451. The reversal of 401809445 is 544908104.

It is a happy number.

It is not a de Polignac number, because 401809445 - 2⁸ = 401809189 is a prime.

It is a super-2 number, since 2×401809445² = 322901660182416050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156986 + ... + 159524.

It is an arithmetic number, because the mean of its divisors is an integer number (31150560).

Almost surely, 2^401809445 is an apocalyptic number.

It is an amenable number.

401809445 is a deficient number, since it is larger than the sum of its proper divisors (96599515).

401809445 is a wasteful number, since it uses less digits than its factorization.

401809445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 401809445 is about 20045.1850827075. The cubic root of 401809445 is about 737.9156373971.

The spelling of 401809445 in words is "four hundred one million, eight hundred nine thousand, four hundred forty-five".