1165381 has 8 divisors (see below), whose sum is σ = 1339520. Its totient is φ = 993168.

The previous prime is 1165379. The next prime is 1165397. The reversal of 1165381 is 1835611.

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 1165381 - 2¹ = 1165379 is a prime.

It is a super-2 number, since 2×1165381² = 2716225750322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165301) 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, 1240 + ... + 1966.

It is an arithmetic number, because the mean of its divisors is an integer number (167440).

2^1165381 is an apocalyptic number.

It is an amenable number.

1165381 is a deficient number, since it is larger than the sum of its proper divisors (174139).

1165381 is an equidigital number, since it uses as much as digits as its factorization.

1165381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963.

The product of its digits is 720, while the sum is 25.

The square root of 1165381 is about 1079.5281376602. The cubic root of 1165381 is about 105.2339755903.

The spelling of 1165381 in words is "one million, one hundred sixty-five thousand, three hundred eighty-one".