12721450 has 48 divisors (see below), whose sum is σ = 28480320. Its totient is φ = 4129920.

The previous prime is 12721447. The next prime is 12721477. The reversal of 12721450 is 5412721.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5694 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (593340).

Almost surely, 2^12721450 is an apocalyptic number.

12721450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12721450 is an abundant number, since it is smaller than the sum of its proper divisors (15758870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12721450 is a wasteful number, since it uses less digits than its factorization.

12721450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1946 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12721450 is about 3566.7141741384. The cubic root of 12721450 is about 233.4419335734.

The spelling of 12721450 in words is "twelve million, seven hundred twenty-one thousand, four hundred fifty".