401940647 has 2 divisors, whose sum is σ = 401940648. Its totient is φ = 401940646.

The previous prime is 401940631. The next prime is 401940653. The reversal of 401940647 is 746049104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401940647 - 2⁴ = 401940631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401940247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200970323 + 200970324.

It is an arithmetic number, because the mean of its divisors is an integer number (200970324).

Almost surely, 2^401940647 is an apocalyptic number.

401940647 is a deficient number, since it is larger than the sum of its proper divisors (1).

401940647 is an equidigital number, since it uses as much as digits as its factorization.

401940647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 401940647 is about 20048.4574718356. The cubic root of 401940647 is about 737.9959453414.

The spelling of 401940647 in words is "four hundred one million, nine hundred forty thousand, six hundred forty-seven".