11987645 has 4 divisors (see below), whose sum is σ = 14385180. Its totient is φ = 9590112.

The previous prime is 11987641. The next prime is 11987653. The reversal of 11987645 is 54678911.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9369721 + 2617924 = 3061^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 11987645 - 2² = 11987641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987641) 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, 1198760 + ... + 1198769.

It is an arithmetic number, because the mean of its divisors is an integer number (3596295).

Almost surely, 2^11987645 is an apocalyptic number.

It is an amenable number.

11987645 is a deficient number, since it is larger than the sum of its proper divisors (2397535).

11987645 is an equidigital number, since it uses as much as digits as its factorization.

11987645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397534.

The product of its digits is 60480, while the sum is 41.

The square root of 11987645 is about 3462.3178652458. The cubic root of 11987645 is about 228.8642496161.

The spelling of 11987645 in words is "eleven million, nine hundred eighty-seven thousand, six hundred forty-five".