212490605 has 8 divisors (see below), whose sum is σ = 255115872. Its totient is φ = 169907728.

The previous prime is 212490601. The next prime is 212490611. The reversal of 212490605 is 506094212.

It is a happy number.

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 212490605 - 2² = 212490601 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 (212490601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1742 + ... + 20688.

It is an arithmetic number, because the mean of its divisors is an integer number (31889484).

Almost surely, 2^212490605 is an apocalyptic number.

It is an amenable number.

212490605 is a deficient number, since it is larger than the sum of its proper divisors (42625267).

212490605 is a wasteful number, since it uses less digits than its factorization.

212490605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21195.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 212490605 is about 14577.0574877099. The cubic root of 212490605 is about 596.7328015011.

It can be divided in two parts, 2124 and 90605, that added together give a palindrome (92729).

The spelling of 212490605 in words is "two hundred twelve million, four hundred ninety thousand, six hundred five".