401646589 has 4 divisors (see below), whose sum is σ = 402629020. Its totient is φ = 400664160.

The previous prime is 401646569. The next prime is 401646611. The reversal of 401646589 is 985646104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 290702500 + 110944089 = 17050^2 + 10533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401646589 is a prime.

It is a super-2 number, since 2×401646589² = 322639964910669842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401646559) 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 in 3 ways as a sum of consecutive naturals, for example, 490602 + ... + 491419.

It is an arithmetic number, because the mean of its divisors is an integer number (100657255).

Almost surely, 2^401646589 is an apocalyptic number.

It is an amenable number.

401646589 is a deficient number, since it is larger than the sum of its proper divisors (982431).

401646589 is an equidigital number, since it uses as much as digits as its factorization.

401646589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982430.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 401646589 is about 20041.1224486055. The cubic root of 401646589 is about 737.8159299114.

It can be divided in two parts, 4016 and 46589, that added together give a palindrome (50605).

The spelling of 401646589 in words is "four hundred one million, six hundred forty-six thousand, five hundred eighty-nine".