381649693 has 4 divisors (see below), whose sum is σ = 382382748. Its totient is φ = 380916640.

The previous prime is 381649691. The next prime is 381649699. The reversal of 381649693 is 396946183.

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 151733124 + 229916569 = 12318^2 + 15163^2 .

It is a cyclic number.

It is not a de Polignac number, because 381649693 - 2¹ = 381649691 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 (381649691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365746 + ... + 366787.

It is an arithmetic number, because the mean of its divisors is an integer number (95595687).

Almost surely, 2^381649693 is an apocalyptic number.

It is an amenable number.

381649693 is a deficient number, since it is larger than the sum of its proper divisors (733055).

381649693 is an equidigital number, since it uses as much as digits as its factorization.

381649693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733054.

The product of its digits is 839808, while the sum is 49.

The square root of 381649693 is about 19535.8565975490. The cubic root of 381649693 is about 725.3622877390.

The spelling of 381649693 in words is "three hundred eighty-one million, six hundred forty-nine thousand, six hundred ninety-three".