12434721 has 32 divisors (see below), whose sum is σ = 19098240. Its totient is φ = 7133184.

The previous prime is 12434717. The next prime is 12434729. The reversal of 12434721 is 12743421.

It is a happy number.

It is not a de Polignac number, because 12434721 - 2² = 12434717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12434691 and 12434700.

It is not an unprimeable number, because it can be changed into a prime (12434729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71791 + ... + 71963.

It is an arithmetic number, because the mean of its divisors is an integer number (596820).

Almost surely, 2^12434721 is an apocalyptic number.

It is an amenable number.

12434721 is a deficient number, since it is larger than the sum of its proper divisors (6663519).

12434721 is a wasteful number, since it uses less digits than its factorization.

12434721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 1344, while the sum is 24.

The square root of 12434721 is about 3526.2899767319. The cubic root of 12434721 is about 231.6747386614.

The spelling of 12434721 in words is "twelve million, four hundred thirty-four thousand, seven hundred twenty-one".