381217684 has 6 divisors (see below), whose sum is σ = 667130954. Its totient is φ = 190608840.

The previous prime is 381217679. The next prime is 381217687. The reversal of 381217684 is 486712183.

It can be written as a sum of positive squares in only one way, i.e., 255104784 + 126112900 = 15972^2 + 11230^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381217687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47652207 + ... + 47652214.

Almost surely, 2^381217684 is an apocalyptic number.

It is an amenable number.

381217684 is a deficient number, since it is larger than the sum of its proper divisors (285913270).

381217684 is a wasteful number, since it uses less digits than its factorization.

381217684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95304425 (or 95304423 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 381217684 is about 19524.7966442675. The cubic root of 381217684 is about 725.0884927258.

The spelling of 381217684 in words is "three hundred eighty-one million, two hundred seventeen thousand, six hundred eighty-four".