381987983 has 8 divisors (see below), whose sum is σ = 424642176. Its totient is φ = 341229600.

The previous prime is 381987961. The next prime is 381988031. The reversal of 381987983 is 389789183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381987983 - 2⁶ = 381987919 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 (381987923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473528 + ... + 474333.

It is an arithmetic number, because the mean of its divisors is an integer number (53080272).

Almost surely, 2^381987983 is an apocalyptic number.

381987983 is a deficient number, since it is larger than the sum of its proper divisors (42654193).

381987983 is a wasteful number, since it uses less digits than its factorization.

381987983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947905.

The product of its digits is 2612736, while the sum is 56.

The square root of 381987983 is about 19544.5128616704. The cubic root of 381987983 is about 725.5765421080.

The spelling of 381987983 in words is "three hundred eighty-one million, nine hundred eighty-seven thousand, nine hundred eighty-three".