12155749 has 8 divisors (see below), whose sum is σ = 12400920. Its totient is φ = 11913216.

The previous prime is 12155747. The next prime is 12155761. The reversal of 12155749 is 94755121.

It can be written as a sum of positive squares in 4 ways, for example, as 980100 + 11175649 = 990^2 + 3343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12155749 - 2¹ = 12155747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10407 + ... + 11515.

It is an arithmetic number, because the mean of its divisors is an integer number (1550115).

Almost surely, 2^12155749 is an apocalyptic number.

It is an amenable number.

12155749 is a deficient number, since it is larger than the sum of its proper divisors (245171).

12155749 is a wasteful number, since it uses less digits than its factorization.

12155749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319.

The product of its digits is 12600, while the sum is 34.

The square root of 12155749 is about 3486.5095726242. The cubic root of 12155749 is about 229.9290833663.

The spelling of 12155749 in words is "twelve million, one hundred fifty-five thousand, seven hundred forty-nine".