12139747 has 4 divisors (see below), whose sum is σ = 12161016. Its totient is φ = 12118480.

The previous prime is 12139741. The next prime is 12139753. The reversal of 12139747 is 74793121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12139741) and next prime (12139753).

It is a cyclic number.

It is not a de Polignac number, because 12139747 - 2³ = 12139739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12139741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9754 + ... + 10927.

It is an arithmetic number, because the mean of its divisors is an integer number (3040254).

Almost surely, 2^12139747 is an apocalyptic number.

12139747 is a deficient number, since it is larger than the sum of its proper divisors (21269).

12139747 is an equidigital number, since it uses as much as digits as its factorization.

12139747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21268.

The product of its digits is 10584, while the sum is 34.

The square root of 12139747 is about 3484.2139716154. The cubic root of 12139747 is about 229.8281450948.

The spelling of 12139747 in words is "twelve million, one hundred thirty-nine thousand, seven hundred forty-seven".