612905 has 8 divisors (see below), whose sum is σ = 755592. Its totient is φ = 476928.

The previous prime is 612889. The next prime is 612923. The reversal of 612905 is 509216.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 295936 = 563^2 + 544^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612905 - 2⁴ = 612889 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (94449).

2⁶¹²⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

612905 is a deficient number, since it is larger than the sum of its proper divisors (142687).

612905 is a wasteful number, since it uses less digits than its factorization.

612905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 612905 is about 782.8824943758. The cubic root of 612905 is about 84.9436766430.

The spelling of 612905 in words is "six hundred twelve thousand, nine hundred five".