1395566257 has 8 divisors (see below), whose sum is σ = 1410834656. Its totient is φ = 1380316032.

The previous prime is 1395566251. The next prime is 1395566269. The reversal of 1395566257 is 7526655931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1395566257 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 1395566257.

It is not an unprimeable number, because it can be changed into a prime (1395566251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198598 + ... + 205504.

It is an arithmetic number, because the mean of its divisors is an integer number (176354332).

Almost surely, 2^1395566257 is an apocalyptic number.

It is an amenable number.

1395566257 is a deficient number, since it is larger than the sum of its proper divisors (15268399).

1395566257 is an equidigital number, since it uses as much as digits as its factorization.

1395566257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9087.

The product of its digits is 1701000, while the sum is 49.

The square root of 1395566257 is about 37357.2785009829. The cubic root of 1395566257 is about 1117.5067457682.

The spelling of 1395566257 in words is "one billion, three hundred ninety-five million, five hundred sixty-six thousand, two hundred fifty-seven".