401982769 has 2 divisors, whose sum is σ = 401982770. Its totient is φ = 401982768.

The previous prime is 401982709. The next prime is 401982803. The reversal of 401982769 is 967289104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334414369 + 67568400 = 18287^2 + 8220^2 .

It is a cyclic number.

It is not a de Polignac number, because 401982769 - 2¹¹ = 401980721 is a prime.

It is a super-2 number, since 2×401982769² = 323180293145814722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401982709) 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, 200991384 + 200991385.

It is an arithmetic number, because the mean of its divisors is an integer number (200991385).

Almost surely, 2^401982769 is an apocalyptic number.

It is an amenable number.

401982769 is a deficient number, since it is larger than the sum of its proper divisors (1).

401982769 is an equidigital number, since it uses as much as digits as its factorization.

401982769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 401982769 is about 20049.5079490745. The cubic root of 401982769 is about 738.0217242548.

The spelling of 401982769 in words is "four hundred one million, nine hundred eighty-two thousand, seven hundred sixty-nine".