40307989 has 8 divisors (see below), whose sum is σ = 40836312. Its totient is φ = 39782400.

The previous prime is 40307957. The next prime is 40308001. The reversal of 40307989 is 98970304.

It can be written as a sum of positive squares in 4 ways, for example, as 14976900 + 25331089 = 3870^2 + 5033^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40307989 - 2⁵ = 40307957 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 (40307909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59557 + ... + 60229.

It is an arithmetic number, because the mean of its divisors is an integer number (5104539).

Almost surely, 2^40307989 is an apocalyptic number.

It is an amenable number.

40307989 is a deficient number, since it is larger than the sum of its proper divisors (528323).

40307989 is a wasteful number, since it uses less digits than its factorization.

40307989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 40307989 is about 6348.8572987586. The cubic root of 40307989 is about 342.8707023986.

The spelling of 40307989 in words is "forty million, three hundred seven thousand, nine hundred eighty-nine".