401890669 has 2 divisors, whose sum is σ = 401890670. Its totient is φ = 401890668.

The previous prime is 401890637. The next prime is 401890711. The reversal of 401890669 is 966098104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335256100 + 66634569 = 18310^2 + 8163^2 .

It is a cyclic number.

It is not a de Polignac number, because 401890669 - 2⁵ = 401890637 is a prime.

It is a super-2 number, since 2×401890669² = 323032219658535122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401890969) 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, 200945334 + 200945335.

It is an arithmetic number, because the mean of its divisors is an integer number (200945335).

Almost surely, 2^401890669 is an apocalyptic number.

It is an amenable number.

401890669 is a deficient number, since it is larger than the sum of its proper divisors (1).

401890669 is an equidigital number, since it uses as much as digits as its factorization.

401890669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 401890669 is about 20047.2110030298. The cubic root of 401890669 is about 737.9653561732.

The spelling of 401890669 in words is "four hundred one million, eight hundred ninety thousand, six hundred sixty-nine".