381860987 has 4 divisors (see below), whose sum is σ = 404323416. Its totient is φ = 359398560.

The previous prime is 381860981. The next prime is 381861023. The reversal of 381860987 is 789068183.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 381860987 - 2⁶ = 381860923 is a prime.

It is a super-2 number, since 2×381860987² = 291635626785228338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381860981) 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, 11231189 + ... + 11231222.

It is an arithmetic number, because the mean of its divisors is an integer number (101080854).

Almost surely, 2^381860987 is an apocalyptic number.

381860987 is a deficient number, since it is larger than the sum of its proper divisors (22462429).

381860987 is a wasteful number, since it uses less digits than its factorization.

381860987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22462428.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 381860987 is about 19541.2637001807. The cubic root of 381860987 is about 725.4961246289.

The spelling of 381860987 in words is "three hundred eighty-one million, eight hundred sixty thousand, nine hundred eighty-seven".