1320197815 has 32 divisors (see below), whose sum is σ = 1776660480. Its totient is φ = 936528384.

The previous prime is 1320197741. The next prime is 1320197819. The reversal of 1320197815 is 5187910231.

It is a cyclic number.

It is not a de Polignac number, because 1320197815 - 2⁹ = 1320197303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320197819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125946 + ... + 136024.

It is an arithmetic number, because the mean of its divisors is an integer number (55520640).

Almost surely, 2^1320197815 is an apocalyptic number.

1320197815 is a deficient number, since it is larger than the sum of its proper divisors (456462665).

1320197815 is a wasteful number, since it uses less digits than its factorization.

1320197815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10191.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1320197815 is about 36334.5264865252. The cubic root of 1320197815 is about 1097.0161045681.

The spelling of 1320197815 in words is "one billion, three hundred twenty million, one hundred ninety-seven thousand, eight hundred fifteen".