40691989 has 18 divisors (see below), whose sum is σ = 45433410. Its totient is φ = 36425376.

The previous prime is 40691921. The next prime is 40692011. The reversal of 40691989 is 98919604.

40691989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 432964 + 40259025 = 658^2 + 6345^2 .

It is not a de Polignac number, because 40691989 - 2⁹ = 40691477 is a prime.

It is a super-2 number, since 2×40691989² = 3311675937552242, 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 (40691909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 373267 + ... + 373375.

Almost surely, 2^40691989 is an apocalyptic number.

It is an amenable number.

40691989 is a deficient number, since it is larger than the sum of its proper divisors (4741421).

40691989 is a wasteful number, since it uses less digits than its factorization.

40691989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 40691989 is about 6379.0272769443. The cubic root of 40691989 is about 343.9560658016.

The spelling of 40691989 in words is "forty million, six hundred ninety-one thousand, nine hundred eighty-nine".