11978523 has 20 divisors (see below), whose sum is σ = 18948600. Its totient is φ = 7515072.

The previous prime is 11978507. The next prime is 11978539. The reversal of 11978523 is 32587911.

It is an interprime number because it is at equal distance from previous prime (11978507) and next prime (11978539).

It is not a de Polignac number, because 11978523 - 2⁴ = 11978507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11978503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2973 + ... + 5726.

It is an arithmetic number, because the mean of its divisors is an integer number (947430).

Almost surely, 2^11978523 is an apocalyptic number.

11978523 is a deficient number, since it is larger than the sum of its proper divisors (6970077).

11978523 is an equidigital number, since it uses as much as digits as its factorization.

11978523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8728 (or 8719 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 11978523 is about 3461.0002889338. Note that the first 3 decimals coincide. The cubic root of 11978523 is about 228.8061834584.

The spelling of 11978523 in words is "eleven million, nine hundred seventy-eight thousand, five hundred twenty-three".