38949881997 has 8 divisors (see below), whose sum is σ = 55928035744. Its totient is φ = 23969158128.

The previous prime is 38949881983. The next prime is 38949882001. The reversal of 38949881997 is 79918894983.

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

It is not a de Polignac number, because 38949881997 - 2⁷ = 38949881869 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 (38949881917) 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, 499357423 + ... + 499357500.

It is an arithmetic number, because the mean of its divisors is an integer number (6991004468).

Almost surely, 2^38949881997 is an apocalyptic number.

It is an amenable number.

38949881997 is a deficient number, since it is larger than the sum of its proper divisors (16978153747).

38949881997 is a wasteful number, since it uses less digits than its factorization.

38949881997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998714939.

The product of its digits is 282175488, while the sum is 75.

The spelling of 38949881997 in words is "thirty-eight billion, nine hundred forty-nine million, eight hundred eighty-one thousand, nine hundred ninety-seven".