381649694 has 32 divisors (see below), whose sum is σ = 646872480. Its totient is φ = 167795712.

The previous prime is 381649691. The next prime is 381649699. The reversal of 381649694 is 496946183.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 43112 + ... + 51204.

It is an arithmetic number, because the mean of its divisors is an integer number (20214765).

Almost surely, 2^381649694 is an apocalyptic number.

381649694 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

381649694 is a deficient number, since it is larger than the sum of its proper divisors (265222786).

381649694 is a wasteful number, since it uses less digits than its factorization.

381649694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8204.

The product of its digits is 1119744, while the sum is 50.

The square root of 381649694 is about 19535.8566231430. The cubic root of 381649694 is about 725.3622883726.

The spelling of 381649694 in words is "three hundred eighty-one million, six hundred forty-nine thousand, six hundred ninety-four".