612440839 has 4 divisors (see below), whose sum is σ = 613000224. Its totient is φ = 611881456.

The previous prime is 612440819. The next prime is 612440869. The reversal of 612440839 is 938044216.

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

It is a cyclic number.

It is not a de Polignac number, because 612440839 - 2¹⁷ = 612309767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612440798 and 612440807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612440819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278047 + ... + 280240.

It is an arithmetic number, because the mean of its divisors is an integer number (153250056).

Almost surely, 2^612440839 is an apocalyptic number.

612440839 is a deficient number, since it is larger than the sum of its proper divisors (559385).

612440839 is a wasteful number, since it uses less digits than its factorization.

612440839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559384.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 612440839 is about 24747.5420799723. The cubic root of 612440839 is about 849.2222824067. Note that the first 4 decimals are identical.

The spelling of 612440839 in words is "six hundred twelve million, four hundred forty thousand, eight hundred thirty-nine".