39988643 has 2 divisors, whose sum is σ = 39988644. Its totient is φ = 39988642.

The previous prime is 39988639. The next prime is 39988649. The reversal of 39988643 is 34688993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39988643 - 2² = 39988639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39988591 and 39988600.

It is not a weakly prime, because it can be changed into another prime (39988649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994321 + 19994322.

It is an arithmetic number, because the mean of its divisors is an integer number (19994322).

Almost surely, 2^39988643 is an apocalyptic number.

39988643 is a deficient number, since it is larger than the sum of its proper divisors (1).

39988643 is an equidigital number, since it uses as much as digits as its factorization.

39988643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 50.

The square root of 39988643 is about 6323.6574069126. The cubic root of 39988643 is about 341.9628192769.

The spelling of 39988643 in words is "thirty-nine million, nine hundred eighty-eight thousand, six hundred forty-three".