12139749 has 12 divisors (see below), whose sum is σ = 17586400. Its totient is φ = 8069544.

The previous prime is 12139741. The next prime is 12139753. The reversal of 12139749 is 94793121.

It is not a de Polignac number, because 12139749 - 2³ = 12139741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 1632 + ... + 5190.

Almost surely, 2^12139749 is an apocalyptic number.

It is an amenable number.

12139749 is a deficient number, since it is larger than the sum of its proper divisors (5446651).

12139749 is a wasteful number, since it uses less digits than its factorization.

12139749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944 (or 3941 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 12139749 is about 3484.2142586242. The cubic root of 12139749 is about 229.8281577160.

The spelling of 12139749 in words is "twelve million, one hundred thirty-nine thousand, seven hundred forty-nine".