212738399 has 4 divisors (see below), whose sum is σ = 219600960. Its totient is φ = 205875840.

The previous prime is 212738387. The next prime is 212738401. The reversal of 212738399 is 993837212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212738399 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 (212738359) 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, 3431234 + ... + 3431295.

It is an arithmetic number, because the mean of its divisors is an integer number (54900240).

Almost surely, 2^212738399 is an apocalyptic number.

212738399 is a deficient number, since it is larger than the sum of its proper divisors (6862561).

212738399 is an equidigital number, since it uses as much as digits as its factorization.

212738399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6862560.

The product of its digits is 163296, while the sum is 44.

The square root of 212738399 is about 14585.5544632352. The cubic root of 212738399 is about 596.9646695832.

The spelling of 212738399 in words is "two hundred twelve million, seven hundred thirty-eight thousand, three hundred ninety-nine".