212724005 has 8 divisors (see below), whose sum is σ = 274904952. Its totient is φ = 157088448.

The previous prime is 212723999. The next prime is 212724013. The reversal of 212724005 is 500427212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50951044 + 161772961 = 7138^2 + 12719^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212724005 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 1636274 + ... + 1636403.

It is an arithmetic number, because the mean of its divisors is an integer number (34363119).

Almost surely, 2^212724005 is an apocalyptic number.

It is an amenable number.

212724005 is a deficient number, since it is larger than the sum of its proper divisors (62180947).

212724005 is a wasteful number, since it uses less digits than its factorization.

212724005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272695.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 212724005 is about 14585.0610214699. The cubic root of 212724005 is about 596.9512056242.

The spelling of 212724005 in words is "two hundred twelve million, seven hundred twenty-four thousand, five".