39660891 has 8 divisors (see below), whose sum is σ = 52945920. Its totient is φ = 26408232.

The previous prime is 39660877. The next prime is 39660911. The reversal of 39660891 is 19806693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39660891 - 2²⁵ = 6106459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39665891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5071 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (6618240).

Almost surely, 2^39660891 is an apocalyptic number.

39660891 is a deficient number, since it is larger than the sum of its proper divisors (13285029).

39660891 is a wasteful number, since it uses less digits than its factorization.

39660891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16185.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 39660891 is about 6297.6893381621. The cubic root of 39660891 is about 341.0259982529.

The spelling of 39660891 in words is "thirty-nine million, six hundred sixty thousand, eight hundred ninety-one".