40731389 has 2 divisors, whose sum is σ = 40731390. Its totient is φ = 40731388.

The previous prime is 40731331. The next prime is 40731403. The reversal of 40731389 is 98313704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28270489 + 12460900 = 5317^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 40731389 - 2²⁰ = 39682813 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40731589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20365694 + 20365695.

It is an arithmetic number, because the mean of its divisors is an integer number (20365695).

Almost surely, 2^40731389 is an apocalyptic number.

It is an amenable number.

40731389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40731389 is an equidigital number, since it uses as much as digits as its factorization.

40731389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40731389 is about 6382.1147749002. The cubic root of 40731389 is about 344.0670417604.

The spelling of 40731389 in words is "forty million, seven hundred thirty-one thousand, three hundred eighty-nine".