1165490399 has 4 divisors (see below), whose sum is σ = 1179532536. Its totient is φ = 1151448264.

The previous prime is 1165490387. The next prime is 1165490441. The reversal of 1165490399 is 9930945611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9930945611 = 311 ⋅31932301.

It is a cyclic number.

It is not a de Polignac number, because 1165490399 - 2⁴ = 1165490383 is a prime.

It is a super-2 number, since 2×1165490399² = 2716735740322358402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165499399) 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, 7020944 + ... + 7021109.

It is an arithmetic number, because the mean of its divisors is an integer number (294883134).

Almost surely, 2^1165490399 is an apocalyptic number.

1165490399 is a deficient number, since it is larger than the sum of its proper divisors (14042137).

1165490399 is an equidigital number, since it uses as much as digits as its factorization.

1165490399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14042136.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 1165490399 is about 34139.2794153597. The cubic root of 1165490399 is about 1052.3726839940.

The spelling of 1165490399 in words is "one billion, one hundred sixty-five million, four hundred ninety thousand, three hundred ninety-nine".