39940487 has 2 divisors, whose sum is σ = 39940488. Its totient is φ = 39940486.

The previous prime is 39940477. The next prime is 39940529. The reversal of 39940487 is 78404993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39940487 - 2¹⁸ = 39678343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39940477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19970243 + 19970244.

It is an arithmetic number, because the mean of its divisors is an integer number (19970244).

Almost surely, 2^39940487 is an apocalyptic number.

39940487 is a deficient number, since it is larger than the sum of its proper divisors (1).

39940487 is an equidigital number, since it uses as much as digits as its factorization.

39940487 is an evil number, because the sum of its binary digits is even.

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

The square root of 39940487 is about 6319.8486532511. The cubic root of 39940487 is about 341.8254954851.

The spelling of 39940487 in words is "thirty-nine million, nine hundred forty thousand, four hundred eighty-seven".