39972887 has 2 divisors, whose sum is σ = 39972888. Its totient is φ = 39972886.

The previous prime is 39972859. The next prime is 39972893. The reversal of 39972887 is 78827993.

It is a strong prime.

It is an emirp because it is prime and its reverse (78827993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39972887 - 2⁸ = 39972631 is a prime.

It is a super-3 number, since 3×39972887³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39972847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19986443 + 19986444.

It is an arithmetic number, because the mean of its divisors is an integer number (19986444).

Almost surely, 2^39972887 is an apocalyptic number.

39972887 is a deficient number, since it is larger than the sum of its proper divisors (1).

39972887 is an equidigital number, since it uses as much as digits as its factorization.

39972887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 39972887 is about 6322.4114861341. The cubic root of 39972887 is about 341.9179009070.

The spelling of 39972887 in words is "thirty-nine million, nine hundred seventy-two thousand, eight hundred eighty-seven".