12920573 has 4 divisors (see below), whose sum is σ = 13366140. Its totient is φ = 12475008.

The previous prime is 12920563. The next prime is 12920581. The reversal of 12920573 is 37502921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8602489 + 4318084 = 2933^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 12920573 - 2⁸ = 12920317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 445537 = 12920573 / (1 + 2 + 9 + 2 + 0 + 5 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222740 + ... + 222797.

It is an arithmetic number, because the mean of its divisors is an integer number (3341535).

Almost surely, 2^12920573 is an apocalyptic number.

It is an amenable number.

12920573 is a deficient number, since it is larger than the sum of its proper divisors (445567).

12920573 is an equidigital number, since it uses as much as digits as its factorization.

12920573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445566.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 12920573 is about 3594.5198566707. The cubic root of 12920573 is about 234.6536197747.

It can be divided in two parts, 129 and 20573, that added together give a palindrome (20702).

The spelling of 12920573 in words is "twelve million, nine hundred twenty thousand, five hundred seventy-three".