1597805947 has 4 divisors (see below), whose sum is σ = 1598347080. Its totient is φ = 1597264816.

The previous prime is 1597805933. The next prime is 1597805971. The reversal of 1597805947 is 7495087951.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1597805947 - 2¹⁵ = 1597773179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1597805747) 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, 266113 + ... + 272050.

It is an arithmetic number, because the mean of its divisors is an integer number (399586770).

Almost surely, 2^1597805947 is an apocalyptic number.

1597805947 is a deficient number, since it is larger than the sum of its proper divisors (541133).

1597805947 is an equidigital number, since it uses as much as digits as its factorization.

1597805947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541132.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The square root of 1597805947 is about 39972.5649289610. The cubic root of 1597805947 is about 1169.0722299024.

The spelling of 1597805947 in words is "one billion, five hundred ninety-seven million, eight hundred five thousand, nine hundred forty-seven".