395243997 has 4 divisors (see below), whose sum is σ = 526992000. Its totient is φ = 263495996.

The previous prime is 395243963. The next prime is 395244011. The reversal of 395243997 is 799342593.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 395243997 - 2¹¹ = 395241949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395243197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65873997 + ... + 65874002.

It is an arithmetic number, because the mean of its divisors is an integer number (131748000).

Almost surely, 2^395243997 is an apocalyptic number.

It is an amenable number.

395243997 is a deficient number, since it is larger than the sum of its proper divisors (131748003).

395243997 is a wasteful number, since it uses less digits than its factorization.

395243997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131748002.

The product of its digits is 1837080, while the sum is 51.

The square root of 395243997 is about 19880.7443774120. The cubic root of 395243997 is about 733.8744380794.

The spelling of 395243997 in words is "three hundred ninety-five million, two hundred forty-three thousand, nine hundred ninety-seven".