12720434 has 4 divisors (see below), whose sum is σ = 19080654. Its totient is φ = 6360216.

The previous prime is 12720427. The next prime is 12720439. The reversal of 12720434 is 43402721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 644809 = 3475^2 + 803^2 .

It is a super-2 number, since 2×12720434² = 323618882296712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12720439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3180107 + ... + 3180110.

Almost surely, 2^12720434 is an apocalyptic number.

12720434 is a deficient number, since it is larger than the sum of its proper divisors (6360220).

12720434 is an equidigital number, since it uses as much as digits as its factorization.

12720434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360219.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 12720434 is about 3566.5717432851. The cubic root of 12720434 is about 233.4357187860.

The spelling of 12720434 in words is "twelve million, seven hundred twenty thousand, four hundred thirty-four".