12617865 has 24 divisors (see below), whose sum is σ = 23554440. Its totient is φ = 6211584.

The previous prime is 12617863. The next prime is 12617867. The reversal of 12617865 is 56871621.

It is an interprime number because it is at equal distance from previous prime (12617863) and next prime (12617867).

It can be written as a sum of positive squares in 4 ways, for example, as 423801 + 12194064 = 651^2 + 3492^2 .

It is not a de Polignac number, because 12617865 - 2¹ = 12617863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12617863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10200 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (981435).

Almost surely, 2^12617865 is an apocalyptic number.

12617865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12617865 is a deficient number, since it is larger than the sum of its proper divisors (10936575).

12617865 is a wasteful number, since it uses less digits than its factorization.

12617865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21593 (or 21590 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12617865 is about 3552.1634252945. The cubic root of 12617865 is about 232.8066020907.

Adding to 12617865 its product of digits (20160), we get a square (12638025 = 3555²).

The spelling of 12617865 in words is "twelve million, six hundred seventeen thousand, eight hundred sixty-five".