212438431 has 4 divisors (see below), whose sum is σ = 212686600. Its totient is φ = 212190264.

The previous prime is 212438407. The next prime is 212438437. The reversal of 212438431 is 134834212.

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

It is a cyclic number.

It is not a de Polignac number, because 212438431 - 2¹⁵ = 212405663 is a prime.

It is a super-2 number, since 2×212438431² = 90260173931483522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212438431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212438437) 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, 122796 + ... + 124513.

It is an arithmetic number, because the mean of its divisors is an integer number (53171650).

Almost surely, 2^212438431 is an apocalyptic number.

212438431 is a deficient number, since it is larger than the sum of its proper divisors (248169).

212438431 is an equidigital number, since it uses as much as digits as its factorization.

212438431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248168.

The product of its digits is 4608, while the sum is 28.

The square root of 212438431 is about 14575.2677848470. The cubic root of 212438431 is about 596.6839577954.

The spelling of 212438431 in words is "two hundred twelve million, four hundred thirty-eight thousand, four hundred thirty-one".