38001993481 has 9 divisors (see below), whose sum is σ = 38284984269. Its totient is φ = 37721083500.

The previous prime is 38001993473. The next prime is 38001993493. The reversal of 38001993481 is 18439910083.

It is a happy number.

The square root of 38001993481 is 194941.

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

It is not a de Polignac number, because 38001993481 - 2³ = 38001993473 is a prime.

It is a super-2 number, since 2×38001993481² (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 (38001993401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29435446 + ... + 29436736.

It is an arithmetic number, because the mean of its divisors is an integer number (4253887141).

Almost surely, 2^38001993481 is an apocalyptic number.

38001993481 is the 194941-st square number.

38001993481 is the 97471-st centered octagonal number.

It is an amenable number.

38001993481 is a deficient number, since it is larger than the sum of its proper divisors (282990788).

38001993481 is an frugal number, since it uses more digits than its factorization.

38001993481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 38001993481 in words is "thirty-eight billion, one million, nine hundred ninety-three thousand, four hundred eighty-one".