381008643 has 4 divisors (see below), whose sum is σ = 508011528. Its totient is φ = 254005760.

The previous prime is 381008633. The next prime is 381008689. The reversal of 381008643 is 346800183.

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 381008643 - 2⁴ = 381008627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381008603) 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, 63501438 + ... + 63501443.

It is an arithmetic number, because the mean of its divisors is an integer number (127002882).

Almost surely, 2^381008643 is an apocalyptic number.

381008643 is a deficient number, since it is larger than the sum of its proper divisors (127002885).

381008643 is a wasteful number, since it uses less digits than its factorization.

381008643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127002884.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 381008643 is about 19519.4426918393. The cubic root of 381008643 is about 724.9559342222.

The spelling of 381008643 in words is "three hundred eighty-one million, eight thousand, six hundred forty-three".