40489891 has 4 divisors (see below), whose sum is σ = 43604512. Its totient is φ = 37375272.

The previous prime is 40489859. The next prime is 40489957. The reversal of 40489891 is 19898404.

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

It is a cyclic number.

It is not a de Polignac number, because 40489891 - 2⁵ = 40489859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40489831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557291 + ... + 1557316.

It is an arithmetic number, because the mean of its divisors is an integer number (10901128).

Almost surely, 2^40489891 is an apocalyptic number.

40489891 is a deficient number, since it is larger than the sum of its proper divisors (3114621).

40489891 is a wasteful number, since it uses less digits than its factorization.

40489891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114620.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 40489891 is about 6363.1667430612. The cubic root of 40489891 is about 343.3856977556.

The spelling of 40489891 in words is "forty million, four hundred eighty-nine thousand, eight hundred ninety-one".