11978539 has 2 divisors, whose sum is σ = 11978540. Its totient is φ = 11978538.

The previous prime is 11978507. The next prime is 11978567. The reversal of 11978539 is 93587911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11978539 - 2⁵ = 11978507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11978495 and 11978504.

It is not a weakly prime, because it can be changed into another prime (11978579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989269 + 5989270.

It is an arithmetic number, because the mean of its divisors is an integer number (5989270).

Almost surely, 2^11978539 is an apocalyptic number.

11978539 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978539 is an equidigital number, since it uses as much as digits as its factorization.

11978539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 11978539 is about 3461.0026004035. The cubic root of 11978539 is about 228.8062853323.

The spelling of 11978539 in words is "eleven million, nine hundred seventy-eight thousand, five hundred thirty-nine".