387071989 has 4 divisors (see below), whose sum is σ = 387130860. Its totient is φ = 387013120.

The previous prime is 387071987. The next prime is 387072011. The reversal of 387071989 is 989170783.

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 191351889 + 195720100 = 13833^2 + 13990^2 .

It is a cyclic number.

It is not a de Polignac number, because 387071989 - 2¹ = 387071987 is a prime.

It is a super-2 number, since 2×387071989² = 299649449336832242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387071987) 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, 18124 + ... + 33205.

It is an arithmetic number, because the mean of its divisors is an integer number (96782715).

Almost surely, 2^387071989 is an apocalyptic number.

It is an amenable number.

387071989 is a deficient number, since it is larger than the sum of its proper divisors (58871).

387071989 is an equidigital number, since it uses as much as digits as its factorization.

387071989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58870.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 387071989 is about 19674.1451910877. The cubic root of 387071989 is about 728.7813463465.

The spelling of 387071989 in words is "three hundred eighty-seven million, seventy-one thousand, nine hundred eighty-nine".