401220997 has 2 divisors, whose sum is σ = 401220998. Its totient is φ = 401220996.

The previous prime is 401220983. The next prime is 401221027. The reversal of 401220997 is 799022104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379821121 + 21399876 = 19489^2 + 4626^2 .

It is a cyclic number.

It is not a de Polignac number, because 401220997 - 2¹¹ = 401218949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401220907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200610498 + 200610499.

It is an arithmetic number, because the mean of its divisors is an integer number (200610499).

Almost surely, 2^401220997 is an apocalyptic number.

It is an amenable number.

401220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

401220997 is an equidigital number, since it uses as much as digits as its factorization.

401220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 401220997 is about 20030.5016662090. The cubic root of 401220997 is about 737.5552367706. Note that the first 3 decimals are identical.

The spelling of 401220997 in words is "four hundred one million, two hundred twenty thousand, nine hundred ninety-seven".