1165615387 has 8 divisors (see below), whose sum is σ = 1255100400. Its totient is φ = 1078454784.

The previous prime is 1165615361. The next prime is 1165615393. The reversal of 1165615387 is 7835165611.

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

It is a cyclic number.

It is not a de Polignac number, because 1165615387 - 2¹⁵ = 1165582619 is a prime.

It is a super-2 number, since 2×1165615387² = 2717318460822319538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165615487) 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, 580062 + ... + 582067.

It is an arithmetic number, because the mean of its divisors is an integer number (156887550).

Almost surely, 2^1165615387 is an apocalyptic number.

1165615387 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1165615387 is a deficient number, since it is larger than the sum of its proper divisors (89485013).

1165615387 is a wasteful number, since it uses less digits than its factorization.

1165615387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162205.

The product of its digits is 151200, while the sum is 43.

The square root of 1165615387 is about 34141.1099263044. The cubic root of 1165615387 is about 1052.4103017086.

The spelling of 1165615387 in words is "one billion, one hundred sixty-five million, six hundred fifteen thousand, three hundred eighty-seven".