212087988 has 144 divisors (see below), whose sum is σ = 670086144. Its totient is φ = 55157760.

The previous prime is 212087987. The next prime is 212087989. The reversal of 212087988 is 889780212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212087987) and next prime (212087989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212087983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132006 + ... + 133602.

It is an arithmetic number, because the mean of its divisors is an integer number (4653376).

Almost surely, 2^212087988 is an apocalyptic number.

212087988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212087988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335043072).

212087988 is an abundant number, since it is smaller than the sum of its proper divisors (457998156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212087988 is a wasteful number, since it uses less digits than its factorization.

212087988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 212087988 is about 14563.2409854400. The cubic root of 212087988 is about 596.3556763236.

The spelling of 212087988 in words is "two hundred twelve million, eighty-seven thousand, nine hundred eighty-eight".