11287809 has 16 divisors (see below), whose sum is σ = 18009600. Its totient is φ = 6946128.

The previous prime is 11287807. The next prime is 11287811. The reversal of 11287809 is 90878211.

It is an interprime number because it is at equal distance from previous prime (11287807) and next prime (11287811).

It is not a de Polignac number, because 11287809 - 2¹ = 11287807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15729 + ... + 16430.

It is an arithmetic number, because the mean of its divisors is an integer number (1125600).

Almost surely, 2^11287809 is an apocalyptic number.

It is an amenable number.

11287809 is a deficient number, since it is larger than the sum of its proper divisors (6721791).

11287809 is a wasteful number, since it uses less digits than its factorization.

11287809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32181 (or 32175 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 11287809 is about 3359.7334715718. The cubic root of 11287809 is about 224.3209750620.

The spelling of 11287809 in words is "eleven million, two hundred eighty-seven thousand, eight hundred nine".