38951996381 has 16 divisors (see below), whose sum is σ = 40880217840. Its totient is φ = 37066014720.

The previous prime is 38951996359. The next prime is 38951996399. The reversal of 38951996381 is 18369915983.

38951996381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2222273881 + 36729722500 = 47141^2 + 191650^2 .

It is a cyclic number.

It is not a de Polignac number, because 38951996381 - 2³⁴ = 21772127197 is a prime.

It is a super-2 number, since 2×38951996381² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38951936381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649205 + ... + 706661.

It is an arithmetic number, because the mean of its divisors is an integer number (2555013615).

Almost surely, 2^38951996381 is an apocalyptic number.

It is an amenable number.

38951996381 is a deficient number, since it is larger than the sum of its proper divisors (1928221459).

38951996381 is a wasteful number, since it uses less digits than its factorization.

38951996381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57824.

The product of its digits is 12597120, while the sum is 62.

The spelling of 38951996381 in words is "thirty-eight billion, nine hundred fifty-one million, nine hundred ninety-six thousand, three hundred eighty-one".