381499643 has 24 divisors (see below), whose sum is σ = 466083072. Its totient is φ = 310755984.

The previous prime is 381499633. The next prime is 381499649. The reversal of 381499643 is 346994183.

It is a happy number.

It is not a de Polignac number, because 381499643 - 2⁶ = 381499579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381499649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187196 + ... + 189222.

It is an arithmetic number, because the mean of its divisors is an integer number (19420128).

Almost surely, 2^381499643 is an apocalyptic number.

381499643 is a deficient number, since it is larger than the sum of its proper divisors (84583429).

381499643 is a wasteful number, since it uses less digits than its factorization.

381499643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2224 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 381499643 is about 19532.0158457851. The cubic root of 381499643 is about 725.2672137481.

The spelling of 381499643 in words is "three hundred eighty-one million, four hundred ninety-nine thousand, six hundred forty-three".