212723987 has 8 divisors (see below), whose sum is σ = 253683456. Its totient is φ = 174407112.

The previous prime is 212723977. The next prime is 212723993. The reversal of 212723987 is 789327212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212723987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212723947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660473 + ... + 660794.

It is an arithmetic number, because the mean of its divisors is an integer number (31710432).

Almost surely, 2^212723987 is an apocalyptic number.

212723987 is a deficient number, since it is larger than the sum of its proper divisors (40959469).

212723987 is a wasteful number, since it uses less digits than its factorization.

212723987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321297.

The product of its digits is 84672, while the sum is 41.

The square root of 212723987 is about 14585.0604044001. The cubic root of 212723987 is about 596.9511887868.

The spelling of 212723987 in words is "two hundred twelve million, seven hundred twenty-three thousand, nine hundred eighty-seven".