40003387 has 2 divisors, whose sum is σ = 40003388. Its totient is φ = 40003386.

The previous prime is 40003319. The next prime is 40003391. The reversal of 40003387 is 78330004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40003387 is a prime.

It is not a weakly prime, because it can be changed into another prime (40003787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20001693 + 20001694.

It is an arithmetic number, because the mean of its divisors is an integer number (20001694).

Almost surely, 2^40003387 is an apocalyptic number.

40003387 is a deficient number, since it is larger than the sum of its proper divisors (1).

40003387 is an equidigital number, since it uses as much as digits as its factorization.

40003387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 40003387 is about 6324.8230805296. The cubic root of 40003387 is about 342.0048418771.

The spelling of 40003387 in words is "forty million, three thousand, three hundred eighty-seven".