381647253 has 8 divisors (see below), whose sum is σ = 548006368. Its totient is φ = 234859824.

The previous prime is 381647249. The next prime is 381647269. The reversal of 381647253 is 352746183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381647253 - 2² = 381647249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 9785827 = 381647253 / (3 + 8 + 1 + 6 + 4 + 7 + 2 + 5 + 3).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381647213) 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 7 ways as a sum of consecutive naturals, for example, 4892875 + ... + 4892952.

It is an arithmetic number, because the mean of its divisors is an integer number (68500796).

Almost surely, 2^381647253 is an apocalyptic number.

It is an amenable number.

381647253 is a deficient number, since it is larger than the sum of its proper divisors (166359115).

381647253 is a wasteful number, since it uses less digits than its factorization.

381647253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9785843.

The product of its digits is 120960, while the sum is 39.

The square root of 381647253 is about 19535.7941481784. The cubic root of 381647253 is about 725.3607419168.

The spelling of 381647253 in words is "three hundred eighty-one million, six hundred forty-seven thousand, two hundred fifty-three".