395447557 has 4 divisors (see below), whose sum is σ = 418709196. Its totient is φ = 372185920.

The previous prime is 395447537. The next prime is 395447561. The reversal of 395447557 is 755744593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755744593 = 857 ⋅881849.

It can be written as a sum of positive squares in 2 ways, for example, as 359519521 + 35928036 = 18961^2 + 5994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395447557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 395447557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395447537) 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, 11630794 + ... + 11630827.

It is an arithmetic number, because the mean of its divisors is an integer number (104677299).

Almost surely, 2^395447557 is an apocalyptic number.

It is an amenable number.

395447557 is a deficient number, since it is larger than the sum of its proper divisors (23261639).

395447557 is a wasteful number, since it uses less digits than its factorization.

395447557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23261638.

The product of its digits is 2646000, while the sum is 49.

The square root of 395447557 is about 19885.8632450291. The cubic root of 395447557 is about 734.0004040169. Note that the first 3 decimals are identical.

The spelling of 395447557 in words is "three hundred ninety-five million, four hundred forty-seven thousand, five hundred fifty-seven".