40347989 has 4 divisors (see below), whose sum is σ = 44016000. Its totient is φ = 36679980.

The previous prime is 40347943. The next prime is 40348013. The reversal of 40347989 is 98974304.

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 a de Polignac number, because none of the positive numbers 2^k-40347989 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 (40347929) 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, 1833989 + ... + 1834010.

It is an arithmetic number, because the mean of its divisors is an integer number (11004000).

Almost surely, 2^40347989 is an apocalyptic number.

It is an amenable number.

40347989 is a deficient number, since it is larger than the sum of its proper divisors (3668011).

40347989 is a wasteful number, since it uses less digits than its factorization.

40347989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668010.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 40347989 is about 6352.0066908025. The cubic root of 40347989 is about 342.9840818572.

The spelling of 40347989 in words is "forty million, three hundred forty-seven thousand, nine hundred eighty-nine".