212406749 has 4 divisors (see below), whose sum is σ = 212436480. Its totient is φ = 212377020.

The previous prime is 212406739. The next prime is 212406781. The reversal of 212406749 is 947604212.

212406749 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212406749 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 (212406739) 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, 3044 + ... + 20834.

It is an arithmetic number, because the mean of its divisors is an integer number (53109120).

Almost surely, 2^212406749 is an apocalyptic number.

It is an amenable number.

212406749 is a deficient number, since it is larger than the sum of its proper divisors (29731).

212406749 is a wasteful number, since it uses less digits than its factorization.

212406749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29730.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 212406749 is about 14574.1809032275. The cubic root of 212406749 is about 596.6542941718.

The spelling of 212406749 in words is "two hundred twelve million, four hundred six thousand, seven hundred forty-nine".