380587661 has 4 divisors (see below), whose sum is σ = 390873852. Its totient is φ = 370301472.

The previous prime is 380587639. The next prime is 380587667. The reversal of 380587661 is 166785083.

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 180902500 + 199685161 = 13450^2 + 14131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-380587661 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 (380587667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5143040 + ... + 5143113.

It is an arithmetic number, because the mean of its divisors is an integer number (97718463).

Almost surely, 2^380587661 is an apocalyptic number.

It is an amenable number.

380587661 is a deficient number, since it is larger than the sum of its proper divisors (10286191).

380587661 is a wasteful number, since it uses less digits than its factorization.

380587661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10286190.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 380587661 is about 19508.6560531473. The cubic root of 380587661 is about 724.6888310318.

The spelling of 380587661 in words is "three hundred eighty million, five hundred eighty-seven thousand, six hundred sixty-one".