12981530 has 16 divisors (see below), whose sum is σ = 23599944. Its totient is φ = 5140800.

The previous prime is 12981511. The next prime is 12981539. The reversal of 12981530 is 3518921.

It can be written as a sum of positive squares in 4 ways, for example, as 11812969 + 1168561 = 3437^2 + 1081^2 .

It is a super-4 number, since 4×12981530⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12981493 and 12981502.

It is not an unprimeable number, because it can be changed into a prime (12981539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5417 + ... + 7436.

Almost surely, 2^12981530 is an apocalyptic number.

12981530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12981530 is a deficient number, since it is larger than the sum of its proper divisors (10618414).

12981530 is a wasteful number, since it uses less digits than its factorization.

12981530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12981530 is about 3602.9890368970. The cubic root of 12981530 is about 235.0220591938.

The spelling of 12981530 in words is "twelve million, nine hundred eighty-one thousand, five hundred thirty".