12213487 has 16 divisors (see below), whose sum is σ = 14450688. Its totient is φ = 10176480.

The previous prime is 12213469. The next prime is 12213493. The reversal of 12213487 is 78431221.

12213487 = 114² + 115² + ... + 336².

It is a cyclic number.

It is not a de Polignac number, because 12213487 - 2¹⁵ = 12180719 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 (12213587) 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, 31698 + ... + 32080.

It is an arithmetic number, because the mean of its divisors is an integer number (903168).

Almost surely, 2^12213487 is an apocalyptic number.

12213487 is a deficient number, since it is larger than the sum of its proper divisors (2237201).

12213487 is a wasteful number, since it uses less digits than its factorization.

12213487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its digits is 2688, while the sum is 28.

The square root of 12213487 is about 3494.7799644613. The cubic root of 12213487 is about 230.2925514831.

It can be divided in two parts, 122134 and 87, that added together give a palindrome (122221).

The spelling of 12213487 in words is "twelve million, two hundred thirteen thousand, four hundred eighty-seven".