395978887 has 2 divisors, whose sum is σ = 395978888. Its totient is φ = 395978886.

The previous prime is 395978851. The next prime is 395978893. The reversal of 395978887 is 788879593.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 395978887 - 2¹¹ = 395976839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395978827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197989443 + 197989444.

It is an arithmetic number, because the mean of its divisors is an integer number (197989444).

Almost surely, 2^395978887 is an apocalyptic number.

395978887 is a deficient number, since it is larger than the sum of its proper divisors (1).

395978887 is an equidigital number, since it uses as much as digits as its factorization.

395978887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 64.

The square root of 395978887 is about 19899.2182509766. The cubic root of 395978887 is about 734.3289953303.

It can be divided in two parts, 39597 and 8887, that added together give a palindrome (48484).

The spelling of 395978887 in words is "three hundred ninety-five million, nine hundred seventy-eight thousand, eight hundred eighty-seven".