39661887 has 4 divisors (see below), whose sum is σ = 52882520. Its totient is φ = 26441256.

The previous prime is 39661877. The next prime is 39661889. The reversal of 39661887 is 78816693.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 39661887 - 2⁶ = 39661823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39661889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6610312 + ... + 6610317.

It is an arithmetic number, because the mean of its divisors is an integer number (13220630).

Almost surely, 2^39661887 is an apocalyptic number.

39661887 is a deficient number, since it is larger than the sum of its proper divisors (13220633).

39661887 is a wasteful number, since it uses less digits than its factorization.

39661887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220632.

The product of its digits is 435456, while the sum is 48.

The square root of 39661887 is about 6297.7684142877. The cubic root of 39661887 is about 341.0288529463.

The spelling of 39661887 in words is "thirty-nine million, six hundred sixty-one thousand, eight hundred eighty-seven".