39895668121 has 3 divisors (see below), whose sum is σ = 39895867861. Its totient is φ = 39895468382.

The previous prime is 39895668107. The next prime is 39895668139. The reversal of 39895668121 is 12186659893.

The square root of 39895668121 is 199739.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12186659893 = 97 ⋅125635669.

It is not a de Polignac number, because 39895668121 - 2⁵ = 39895668089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39895668821) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 99870 + ... + 299608.

Almost surely, 2^39895668121 is an apocalyptic number.

39895668121 is the 199739-th square number.

39895668121 is the 99870-th centered octagonal number.

It is an amenable number.

39895668121 is a deficient number, since it is larger than the sum of its proper divisors (199740).

39895668121 is an frugal number, since it uses more digits than its factorization.

39895668121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399478 (or 199739 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 58.

The spelling of 39895668121 in words is "thirty-nine billion, eight hundred ninety-five million, six hundred sixty-eight thousand, one hundred twenty-one".