40039387 has 2 divisors, whose sum is σ = 40039388. Its totient is φ = 40039386.

The previous prime is 40039379. The next prime is 40039393. The reversal of 40039387 is 78393004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40039387 - 2³ = 40039379 is a prime.

It is a super-2 number, since 2×40039387² = 3206305022671538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40039187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20019693 + 20019694.

It is an arithmetic number, because the mean of its divisors is an integer number (20019694).

Almost surely, 2^40039387 is an apocalyptic number.

40039387 is a deficient number, since it is larger than the sum of its proper divisors (1).

40039387 is an equidigital number, since it uses as much as digits as its factorization.

40039387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 40039387 is about 6327.6683699448. The cubic root of 40039387 is about 342.1074038828.

The spelling of 40039387 in words is "forty million, thirty-nine thousand, three hundred eighty-seven".