12467721 has 16 divisors (see below), whose sum is σ = 19441664. Its totient is φ = 6958224.

The previous prime is 12467683. The next prime is 12467759. The reversal of 12467721 is 12776421.

It is an interprime number because it is at equal distance from previous prime (12467683) and next prime (12467759).

It is not a de Polignac number, because 12467721 - 2⁶ = 12467657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12417721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6001 + ... + 7806.

It is an arithmetic number, because the mean of its divisors is an integer number (1215104).

Almost surely, 2^12467721 is an apocalyptic number.

It is an amenable number.

12467721 is a deficient number, since it is larger than the sum of its proper divisors (6973943).

12467721 is a wasteful number, since it uses less digits than its factorization.

12467721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13860.

The product of its digits is 4704, while the sum is 30.

The square root of 12467721 is about 3530.9660151296. The cubic root of 12467721 is about 231.8795016841.

The spelling of 12467721 in words is "twelve million, four hundred sixty-seven thousand, seven hundred twenty-one".