612639 has 6 divisors (see below), whose sum is σ = 884936. Its totient is φ = 408420.

The previous prime is 612637. The next prime is 612643. The reversal of 612639 is 936216.

It is a happy number.

It is not a de Polignac number, because 612639 - 2¹ = 612637 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 (612637) 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 5 ways as a sum of consecutive naturals, for example, 34027 + ... + 34044.

2⁶¹²⁶³⁹ is an apocalyptic number.

612639 is a deficient number, since it is larger than the sum of its proper divisors (272297).

612639 is a wasteful number, since it uses less digits than its factorization.

612639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68077 (or 68074 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 612639 is about 782.7125909298. The cubic root of 612639 is about 84.9313863819.

The spelling of 612639 in words is "six hundred twelve thousand, six hundred thirty-nine".