401820197 has 2 divisors, whose sum is σ = 401820198. Its totient is φ = 401820196.

The previous prime is 401820193. The next prime is 401820217. The reversal of 401820197 is 791028104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333939076 + 67881121 = 18274^2 + 8239^2 .

It is a cyclic number.

It is not a de Polignac number, because 401820197 - 2² = 401820193 is a prime.

It is a super-3 number, since 3×401820197³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401820193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200910098 + 200910099.

It is an arithmetic number, because the mean of its divisors is an integer number (200910099).

Almost surely, 2^401820197 is an apocalyptic number.

It is an amenable number.

401820197 is a deficient number, since it is larger than the sum of its proper divisors (1).

401820197 is an equidigital number, since it uses as much as digits as its factorization.

401820197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 401820197 is about 20045.4532749948. The cubic root of 401820197 is about 737.9222192883.

The spelling of 401820197 in words is "four hundred one million, eight hundred twenty thousand, one hundred ninety-seven".