11487391 has 4 divisors (see below), whose sum is σ = 11857984. Its totient is φ = 11116800.

The previous prime is 11487389. The next prime is 11487403. The reversal of 11487391 is 19378411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19378411 = 13 ⋅1490647.

It is a cyclic number.

It is not a de Polignac number, because 11487391 - 2¹ = 11487389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11487331) 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, 185250 + ... + 185311.

It is an arithmetic number, because the mean of its divisors is an integer number (2964496).

Almost surely, 2^11487391 is an apocalyptic number.

11487391 is a deficient number, since it is larger than the sum of its proper divisors (370593).

11487391 is an equidigital number, since it uses as much as digits as its factorization.

11487391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370592.

The product of its digits is 6048, while the sum is 34.

The square root of 11487391 is about 3389.3053860636. The cubic root of 11487391 is about 225.6353466300.

The spelling of 11487391 in words is "eleven million, four hundred eighty-seven thousand, three hundred ninety-one".