38447969857 has 12 divisors (see below), whose sum is σ = 42274773520. Its totient is φ = 34941301560.

The previous prime is 38447969851. The next prime is 38447969891. The reversal of 38447969857 is 75896974483.

It is a happy number.

It is not a de Polignac number, because 38447969857 - 2¹¹ = 38447967809 is a prime.

It is a super-2 number, since 2×38447969857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38447969851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332494 + ... + 432952.

Almost surely, 2^38447969857 is an apocalyptic number.

It is an amenable number.

38447969857 is a deficient number, since it is larger than the sum of its proper divisors (3826803663).

38447969857 is a wasteful number, since it uses less digits than its factorization.

38447969857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103644 (or 103633 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 70.

The spelling of 38447969857 in words is "thirty-eight billion, four hundred forty-seven million, nine hundred sixty-nine thousand, eight hundred fifty-seven".