39966913 has 4 divisors (see below), whose sum is σ = 45676480. Its totient is φ = 34257348.

The previous prime is 39966889. The next prime is 39966917. The reversal of 39966913 is 31966993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31966993 = 197 ⋅162269.

It is a cyclic number.

It is not a de Polignac number, because 39966913 - 2¹⁷ = 39835841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39966917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2854773 + ... + 2854786.

It is an arithmetic number, because the mean of its divisors is an integer number (11419120).

Almost surely, 2^39966913 is an apocalyptic number.

It is an amenable number.

39966913 is a deficient number, since it is larger than the sum of its proper divisors (5709567).

39966913 is an equidigital number, since it uses as much as digits as its factorization.

39966913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709566.

The product of its digits is 236196, while the sum is 46.

The square root of 39966913 is about 6321.9390221672. The cubic root of 39966913 is about 341.9008666999.

The spelling of 39966913 in words is "thirty-nine million, nine hundred sixty-six thousand, nine hundred thirteen".