11917639 has 2 divisors, whose sum is σ = 11917640. Its totient is φ = 11917638.

The previous prime is 11917627. The next prime is 11917643. The reversal of 11917639 is 93671911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11917639 - 2⁹ = 11917127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11917598 and 11917607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11917669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5958819 + 5958820.

It is an arithmetic number, because the mean of its divisors is an integer number (5958820).

Almost surely, 2^11917639 is an apocalyptic number.

11917639 is a deficient number, since it is larger than the sum of its proper divisors (1).

11917639 is an equidigital number, since it uses as much as digits as its factorization.

11917639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 11917639 is about 3452.1933607491. The cubic root of 11917639 is about 228.4178689005.

The spelling of 11917639 in words is "eleven million, nine hundred seventeen thousand, six hundred thirty-nine".