11399691 has 4 divisors (see below), whose sum is σ = 15199592. Its totient is φ = 7599792.

The previous prime is 11399683. The next prime is 11399761. The reversal of 11399691 is 19699311.

It is a happy number.

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

It is not a de Polignac number, because 11399691 - 2³ = 11399683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11399671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1899946 + ... + 1899951.

It is an arithmetic number, because the mean of its divisors is an integer number (3799898).

Almost surely, 2^11399691 is an apocalyptic number.

11399691 is a deficient number, since it is larger than the sum of its proper divisors (3799901).

11399691 is an equidigital number, since it uses as much as digits as its factorization.

11399691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799900.

The product of its digits is 13122, while the sum is 39.

The square root of 11399691 is about 3376.3428439659. The cubic root of 11399691 is about 225.0596779970.

It can be divided in two parts, 11399 and 691, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 11399691 in words is "eleven million, three hundred ninety-nine thousand, six hundred ninety-one".