9939880857 has 4 divisors (see below), whose sum is σ = 13253174480. Its totient is φ = 6626587236.

The previous prime is 9939880849. The next prime is 9939880901. The reversal of 9939880857 is 7580889399.

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.

It is not a de Polignac number, because 9939880857 - 2³ = 9939880849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9939880757) 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, 1656646807 + ... + 1656646812.

It is an arithmetic number, because the mean of its divisors is an integer number (3313293620).

Almost surely, 2^9939880857 is an apocalyptic number.

It is an amenable number.

9939880857 is a deficient number, since it is larger than the sum of its proper divisors (3313293623).

9939880857 is a wasteful number, since it uses less digits than its factorization.

9939880857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313293622.

The product of its (nonzero) digits is 39191040, while the sum is 66.

The square root of 9939880857 is about 99698.9511328981. The cubic root of 9939880857 is about 2150.1085834470.

The spelling of 9939880857 in words is "nine billion, nine hundred thirty-nine million, eight hundred eighty thousand, eight hundred fifty-seven".