12155725 has 24 divisors (see below), whose sum is σ = 16065440. Its totient is φ = 9097920.

The previous prime is 12155723. The next prime is 12155747. The reversal of 12155725 is 52755121.

12155725 = 188² + 189² + ... + 350².

It is not a de Polignac number, because 12155725 - 2¹ = 12155723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12155693 and 12155702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74494 + ... + 74656.

Almost surely, 2^12155725 is an apocalyptic number.

It is an amenable number.

12155725 is a deficient number, since it is larger than the sum of its proper divisors (3909715).

12155725 is a wasteful number, since it uses less digits than its factorization.

12155725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 344 counting only the distinct ones).

The product of its digits is 3500, while the sum is 28.

The square root of 12155725 is about 3486.5061307848. The cubic root of 12155725 is about 229.9289320442.

It can be divided in two parts, 12155 and 725, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 12155725 in words is "twelve million, one hundred fifty-five thousand, seven hundred twenty-five".