11387865 has 32 divisors (see below), whose sum is σ = 19284480. Its totient is φ = 5729024.

The previous prime is 11387863. The next prime is 11387867. The reversal of 11387865 is 56878311.

11387865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11387863) and next prime (11387867).

It is a cyclic number.

It is not a de Polignac number, because 11387865 - 2¹ = 11387863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11387861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20167 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^11387865 is an apocalyptic number.

11387865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11387865 is a deficient number, since it is larger than the sum of its proper divisors (7896615).

11387865 is a wasteful number, since it uses less digits than its factorization.

11387865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641.

The product of its digits is 40320, while the sum is 39.

The square root of 11387865 is about 3374.5910863392. The cubic root of 11387865 is about 224.9818256925.

It can be divided in two parts, 113 and 87865, that added together give a palindrome (87978).

The spelling of 11387865 in words is "eleven million, three hundred eighty-seven thousand, eight hundred sixty-five".