212729823 has 12 divisors (see below), whose sum is σ = 325351728. Its totient is φ = 133477440.

The previous prime is 212729821. The next prime is 212729887. The reversal of 212729823 is 328927212.

It is not a de Polignac number, because 212729823 - 2¹ = 212729821 is a prime.

It is a super-2 number, since 2×212729823² = 90507955187222658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212729821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 695043 + ... + 695348.

It is an arithmetic number, because the mean of its divisors is an integer number (27112644).

Almost surely, 2^212729823 is an apocalyptic number.

212729823 is a deficient number, since it is larger than the sum of its proper divisors (112621905).

212729823 is a wasteful number, since it uses less digits than its factorization.

212729823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390414 (or 1390411 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 212729823 is about 14585.2604707629. The cubic root of 212729823 is about 596.9566477783.

The spelling of 212729823 in words is "two hundred twelve million, seven hundred twenty-nine thousand, eight hundred twenty-three".