212730145 has 8 divisors (see below), whose sum is σ = 255502656. Its totient is φ = 170033136.

The previous prime is 212730143. The next prime is 212730149. The reversal of 212730145 is 541037212.

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 212730145 - 2¹ = 212730143 is a prime.

It is a super-2 number, since 2×212730145² = 90508229183442050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212730143) 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, 12477 + ... + 24106.

It is an arithmetic number, because the mean of its divisors is an integer number (31937832).

Almost surely, 2^212730145 is an apocalyptic number.

It is an amenable number.

212730145 is a deficient number, since it is larger than the sum of its proper divisors (42772511).

212730145 is a wasteful number, since it uses less digits than its factorization.

212730145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37751.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 212730145 is about 14585.2715093001. The cubic root of 212730145 is about 596.9569489740.

Adding to 212730145 its reverse (541037212), we get a palindrome (753767357).

The spelling of 212730145 in words is "two hundred twelve million, seven hundred thirty thousand, one hundred forty-five".