12155745 has 16 divisors (see below), whose sum is σ = 22227840. Its totient is φ = 5556864.

The previous prime is 12155723. The next prime is 12155747. The reversal of 12155745 is 54755121.

It is not a de Polignac number, because 12155745 - 2⁷ = 12155617 is a prime.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 57780 + ... + 57989.

It is an arithmetic number, because the mean of its divisors is an integer number (1389240).

Almost surely, 2^12155745 is an apocalyptic number.

12155745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12155745 is a deficient number, since it is larger than the sum of its proper divisors (10072095).

12155745 is a wasteful number, since it uses less digits than its factorization.

12155745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115784.

The product of its digits is 7000, while the sum is 30.

The square root of 12155745 is about 3486.5089989845. The cubic root of 12155745 is about 229.9290581459.

The spelling of 12155745 in words is "twelve million, one hundred fifty-five thousand, seven hundred forty-five".