40081789 has 4 divisors (see below), whose sum is σ = 43725600. Its totient is φ = 36437980.

The previous prime is 40081777. The next prime is 40081813. The reversal of 40081789 is 98718004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40081789 - 2⁵ = 40081757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40081759) 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, 1821889 + ... + 1821910.

It is an arithmetic number, because the mean of its divisors is an integer number (10931400).

Almost surely, 2^40081789 is an apocalyptic number.

It is an amenable number.

40081789 is a deficient number, since it is larger than the sum of its proper divisors (3643811).

40081789 is a wasteful number, since it uses less digits than its factorization.

40081789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643810.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 40081789 is about 6331.0180066084. The cubic root of 40081789 is about 342.2281260148.

The spelling of 40081789 in words is "forty million, eighty-one thousand, seven hundred eighty-nine".