11781387 has 12 divisors (see below), whose sum is σ = 17913480. Its totient is φ = 7440768.

The previous prime is 11781383. The next prime is 11781389. The reversal of 11781387 is 78318711.

11781387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11781387 - 2² = 11781383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11781383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34278 + ... + 34619.

It is an arithmetic number, because the mean of its divisors is an integer number (1492790).

Almost surely, 2^11781387 is an apocalyptic number.

11781387 is a deficient number, since it is larger than the sum of its proper divisors (6132093).

11781387 is a wasteful number, since it uses less digits than its factorization.

11781387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68922 (or 68919 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 11781387 is about 3432.4025113614. The cubic root of 11781387 is about 227.5440449279.

The spelling of 11781387 in words is "eleven million, seven hundred eighty-one thousand, three hundred eighty-seven".