612399709 has 4 divisors (see below), whose sum is σ = 613139260. Its totient is φ = 611660160.

The previous prime is 612399649. The next prime is 612399713. The reversal of 612399709 is 907993216.

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 304502500 + 307897209 = 17450^2 + 17547^2 .

It is a cyclic number.

It is not a de Polignac number, because 612399709 - 2⁹ = 612399197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612399719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368532 + ... + 370189.

It is an arithmetic number, because the mean of its divisors is an integer number (153284815).

Almost surely, 2^612399709 is an apocalyptic number.

It is an amenable number.

612399709 is a deficient number, since it is larger than the sum of its proper divisors (739551).

612399709 is an equidigital number, since it uses as much as digits as its factorization.

612399709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739550.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 612399709 is about 24746.7110744034. The cubic root of 612399709 is about 849.2032714306.

The spelling of 612399709 in words is "six hundred twelve million, three hundred ninety-nine thousand, seven hundred nine".