381805573 has 4 divisors (see below), whose sum is σ = 382137868. Its totient is φ = 381473280.

The previous prime is 381805559. The next prime is 381805583. The reversal of 381805573 is 375508183.

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

It can be written as a sum of positive squares in 2 ways, for example, as 330439684 + 51365889 = 18178^2 + 7167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381805573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381805583) 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, 164418 + ... + 166723.

It is an arithmetic number, because the mean of its divisors is an integer number (95534467).

Almost surely, 2^381805573 is an apocalyptic number.

It is an amenable number.

381805573 is a deficient number, since it is larger than the sum of its proper divisors (332295).

381805573 is a wasteful number, since it uses less digits than its factorization.

381805573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332294.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 381805573 is about 19539.8457772829. The cubic root of 381805573 is about 725.4610293207.

The spelling of 381805573 in words is "three hundred eighty-one million, eight hundred five thousand, five hundred seventy-three".