381761885 has 4 divisors (see below), whose sum is σ = 458114268. Its totient is φ = 305409504.

The previous prime is 381761881. The next prime is 381761899. The reversal of 381761885 is 588167183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92659876 + 289102009 = 9626^2 + 17003^2 .

It is a cyclic number.

It is not a de Polignac number, because 381761885 - 2² = 381761881 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 (381761881) 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, 38176184 + ... + 38176193.

It is an arithmetic number, because the mean of its divisors is an integer number (114528567).

Almost surely, 2^381761885 is an apocalyptic number.

It is an amenable number.

381761885 is a deficient number, since it is larger than the sum of its proper divisors (76352383).

381761885 is an equidigital number, since it uses as much as digits as its factorization.

381761885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76352382.

The product of its digits is 322560, while the sum is 47.

The square root of 381761885 is about 19538.7278245028. The cubic root of 381761885 is about 725.4333580375.

The spelling of 381761885 in words is "three hundred eighty-one million, seven hundred sixty-one thousand, eight hundred eighty-five".