320841987 has 4 divisors (see below), whose sum is σ = 427789320. Its totient is φ = 213894656.

The previous prime is 320841979. The next prime is 320842007. The reversal of 320841987 is 789148023.

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 320841987 - 2³ = 320841979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320841907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53473662 + ... + 53473667.

It is an arithmetic number, because the mean of its divisors is an integer number (106947330).

Almost surely, 2^320841987 is an apocalyptic number.

320841987 is a deficient number, since it is larger than the sum of its proper divisors (106947333).

320841987 is a wasteful number, since it uses less digits than its factorization.

320841987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106947332.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 320841987 is about 17912.0626115476. The cubic root of 320841987 is about 684.5897605768.

The spelling of 320841987 in words is "three hundred twenty million, eight hundred forty-one thousand, nine hundred eighty-seven".