380887921 has 4 divisors (see below), whose sum is σ = 380974500. Its totient is φ = 380801344.

The previous prime is 380887919. The next prime is 380887951. The reversal of 380887921 is 129788083.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129788083 = 41 ⋅3165563.

It can be written as a sum of positive squares in 2 ways, for example, as 253446400 + 127441521 = 15920^2 + 11289^2 .

It is a cyclic number.

It is not a de Polignac number, because 380887921 - 2¹ = 380887919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (380887901) 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, 36316 + ... + 45613.

It is an arithmetic number, because the mean of its divisors is an integer number (95243625).

Almost surely, 2^380887921 is an apocalyptic number.

It is an amenable number.

380887921 is a deficient number, since it is larger than the sum of its proper divisors (86579).

380887921 is an equidigital number, since it uses as much as digits as its factorization.

380887921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86578.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 380887921 is about 19516.3500942159. The cubic root of 380887921 is about 724.8793590781.

The spelling of 380887921 in words is "three hundred eighty million, eight hundred eighty-seven thousand, nine hundred twenty-one".