401820395 has 4 divisors (see below), whose sum is σ = 482184480. Its totient is φ = 321456312.

The previous prime is 401820389. The next prime is 401820409. The reversal of 401820395 is 593028104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401820395 - 2¹⁸ = 401558251 is a prime.

It is a super-3 number, since 3×401820395³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40182035 + ... + 40182044.

It is an arithmetic number, because the mean of its divisors is an integer number (120546120).

Almost surely, 2^401820395 is an apocalyptic number.

401820395 is a deficient number, since it is larger than the sum of its proper divisors (80364085).

401820395 is an equidigital number, since it uses as much as digits as its factorization.

401820395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80364084.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 401820395 is about 20045.4582137700. The cubic root of 401820395 is about 737.9223404939.

Adding to 401820395 its reverse (593028104), we get a palindrome (994848499).

The spelling of 401820395 in words is "four hundred one million, eight hundred twenty thousand, three hundred ninety-five".