401239841 has 2 divisors, whose sum is σ = 401239842. Its totient is φ = 401239840.

The previous prime is 401239823. The next prime is 401239843. The reversal of 401239841 is 148932104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242580625 + 158659216 = 15575^2 + 12596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401239841 is a prime.

Together with 401239843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 401239798 and 401239807.

It is not a weakly prime, because it can be changed into another prime (401239843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200619920 + 200619921.

It is an arithmetic number, because the mean of its divisors is an integer number (200619921).

Almost surely, 2^401239841 is an apocalyptic number.

It is an amenable number.

401239841 is a deficient number, since it is larger than the sum of its proper divisors (1).

401239841 is an equidigital number, since it uses as much as digits as its factorization.

401239841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 401239841 is about 20030.9720433133. The cubic root of 401239841 is about 737.5667834190.

The spelling of 401239841 in words is "four hundred one million, two hundred thirty-nine thousand, eight hundred forty-one".