12139847 has 2 divisors, whose sum is σ = 12139848. Its totient is φ = 12139846.

The previous prime is 12139823. The next prime is 12139849. The reversal of 12139847 is 74893121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12139847 - 2⁸ = 12139591 is a prime.

Together with 12139849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12139849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069923 + 6069924.

It is an arithmetic number, because the mean of its divisors is an integer number (6069924).

Almost surely, 2^12139847 is an apocalyptic number.

12139847 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139847 is an equidigital number, since it uses as much as digits as its factorization.

12139847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 12139847 is about 3484.2283220248. The cubic root of 12139847 is about 229.8287761555.

The spelling of 12139847 in words is "twelve million, one hundred thirty-nine thousand, eight hundred forty-seven".