381840539 has 4 divisors (see below), whose sum is σ = 382042056. Its totient is φ = 381639024.

The previous prime is 381840497. The next prime is 381840631. The reversal of 381840539 is 935048183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381840539 - 2¹² = 381836443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381840496 and 381840505.

It is not an unprimeable number, because it can be changed into a prime (381840139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97889 + ... + 101714.

It is an arithmetic number, because the mean of its divisors is an integer number (95510514).

Almost surely, 2^381840539 is an apocalyptic number.

381840539 is a deficient number, since it is larger than the sum of its proper divisors (201517).

381840539 is a wasteful number, since it uses less digits than its factorization.

381840539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201516.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 381840539 is about 19540.7404926221. The cubic root of 381840539 is about 725.4831747072.

The spelling of 381840539 in words is "three hundred eighty-one million, eight hundred forty thousand, five hundred thirty-nine".