381928849 has 3 divisors (see below), whose sum is σ = 381948393. Its totient is φ = 381909306.

The previous prime is 381928831. The next prime is 381928853. The reversal of 381928849 is 948829183.

The square root of 381928849 is 19543.

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: 948829183 = 31 ⋅30607393.

It is a de Polignac number, because none of the positive numbers 2^k-381928849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381928796 and 381928805.

It is not an unprimeable number, because it can be changed into a prime (381968849) 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, 9772 + ... + 29314.

It is an arithmetic number, because the mean of its divisors is an integer number (127316131).

Almost surely, 2^381928849 is an apocalyptic number.

381928849 is the 19543-rd square number.

381928849 is the 9772-nd centered octagonal number.

It is an amenable number.

381928849 is a deficient number, since it is larger than the sum of its proper divisors (19544).

381928849 is an frugal number, since it uses more digits than its factorization.

381928849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39086 (or 19543 counting only the distinct ones).

The product of its digits is 995328, while the sum is 52.

The cubic root of 381928849 is about 725.5390989952.

The spelling of 381928849 in words is "three hundred eighty-one million, nine hundred twenty-eight thousand, eight hundred forty-nine".