212539693 has 4 divisors (see below), whose sum is σ = 212579100. Its totient is φ = 212500288.

The previous prime is 212539673. The next prime is 212539697. The reversal of 212539693 is 396935212.

212539693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206841924 + 5697769 = 14382^2 + 2387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212539693 is a prime.

It is a super-2 number, since 2×212539693² = 90346242201068498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212539697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10030 + ... + 22927.

It is an arithmetic number, because the mean of its divisors is an integer number (53144775).

Almost surely, 2^212539693 is an apocalyptic number.

It is an amenable number.

212539693 is a deficient number, since it is larger than the sum of its proper divisors (39407).

212539693 is an equidigital number, since it uses as much as digits as its factorization.

212539693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39406.

The product of its digits is 87480, while the sum is 40.

The square root of 212539693 is about 14578.7411322103. The cubic root of 212539693 is about 596.7787488884.

The spelling of 212539693 in words is "two hundred twelve million, five hundred thirty-nine thousand, six hundred ninety-three".