11647421 has 4 divisors (see below), whose sum is σ = 11762844. Its totient is φ = 11532000.

The previous prime is 11647417. The next prime is 11647423. The reversal of 11647421 is 12474611.

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 11356900 + 290521 = 3370^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 11647421 - 2² = 11647417 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 (11647423) 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, 57560 + ... + 57761.

It is an arithmetic number, because the mean of its divisors is an integer number (2940711).

Almost surely, 2^11647421 is an apocalyptic number.

It is an amenable number.

11647421 is a deficient number, since it is larger than the sum of its proper divisors (115423).

11647421 is a wasteful number, since it uses less digits than its factorization.

11647421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115422.

The product of its digits is 1344, while the sum is 26.

The square root of 11647421 is about 3412.8318153698. The cubic root of 11647421 is about 226.6782882834.

The spelling of 11647421 in words is "eleven million, six hundred forty-seven thousand, four hundred twenty-one".