381699647 has 4 divisors (see below), whose sum is σ = 436228176. Its totient is φ = 327171120.

The previous prime is 381699641. The next prime is 381699667. The reversal of 381699647 is 746996183.

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 381699647 - 2⁸ = 381699391 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 (381699641) 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, 27264254 + ... + 27264267.

It is an arithmetic number, because the mean of its divisors is an integer number (109057044).

Almost surely, 2^381699647 is an apocalyptic number.

381699647 is a deficient number, since it is larger than the sum of its proper divisors (54528529).

381699647 is an equidigital number, since it uses as much as digits as its factorization.

381699647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54528528.

The product of its digits is 1959552, while the sum is 53.

The square root of 381699647 is about 19537.1350765664. The cubic root of 381699647 is about 725.3939338337.

The spelling of 381699647 in words is "three hundred eighty-one million, six hundred ninety-nine thousand, six hundred forty-seven".