11523947 has 4 divisors (see below), whose sum is σ = 11573640. Its totient is φ = 11474256.

The previous prime is 11523931. The next prime is 11523959. The reversal of 11523947 is 74932511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74932511 = 37 ⋅2025203.

It is a cyclic number.

It is not a de Polignac number, because 11523947 - 2⁴ = 11523931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11523917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24497 + ... + 24962.

It is an arithmetic number, because the mean of its divisors is an integer number (2893410).

Almost surely, 2^11523947 is an apocalyptic number.

11523947 is a deficient number, since it is larger than the sum of its proper divisors (49693).

11523947 is an equidigital number, since it uses as much as digits as its factorization.

11523947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49692.

The product of its digits is 7560, while the sum is 32.

The square root of 11523947 is about 3394.6939479134. The cubic root of 11523947 is about 225.8744375224.

The spelling of 11523947 in words is "eleven million, five hundred twenty-three thousand, nine hundred forty-seven".