11905639 has 2 divisors, whose sum is σ = 11905640. Its totient is φ = 11905638.

The previous prime is 11905613. The next prime is 11905657. The reversal of 11905639 is 93650911.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11905639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11905679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5952819 + 5952820.

It is an arithmetic number, because the mean of its divisors is an integer number (5952820).

Almost surely, 2^11905639 is an apocalyptic number.

11905639 is a deficient number, since it is larger than the sum of its proper divisors (1).

11905639 is an equidigital number, since it uses as much as digits as its factorization.

11905639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 11905639 is about 3450.4548975461. The cubic root of 11905639 is about 228.3411776776.

It can be divided in two parts, 11905 and 639, that added together give a square (12544 = 112²).

The spelling of 11905639 in words is "eleven million, nine hundred five thousand, six hundred thirty-nine".