401982709 has 2 divisors, whose sum is σ = 401982710. Its totient is φ = 401982708.

The previous prime is 401982703. The next prime is 401982769. The reversal of 401982709 is 907289104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345402225 + 56580484 = 18585^2 + 7522^2 .

It is a cyclic number.

It is not a de Polignac number, because 401982709 - 2¹¹ = 401980661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401982703) by changing a digit.

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 as a sum of consecutive naturals, namely, 200991354 + 200991355.

It is an arithmetic number, because the mean of its divisors is an integer number (200991355).

Almost surely, 2^401982709 is an apocalyptic number.

It is an amenable number.

401982709 is a deficient number, since it is larger than the sum of its proper divisors (1).

401982709 is an equidigital number, since it uses as much as digits as its factorization.

401982709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 401982709 is about 20049.5064527783. The cubic root of 401982709 is about 738.0216875357.

The spelling of 401982709 in words is "four hundred one million, nine hundred eighty-two thousand, seven hundred nine".