212249808 has 140 divisors (see below), whose sum is σ = 637542528. Its totient is φ = 68351040.

The previous prime is 212249771. The next prime is 212249813. The reversal of 212249808 is 808942212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 361291 + ... + 361877.

Almost surely, 2^212249808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212249808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318771264).

212249808 is an abundant number, since it is smaller than the sum of its proper divisors (425292720).

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

212249808 is an equidigital number, since it uses as much as digits as its factorization.

212249808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 212249808 is about 14568.7956949090. The cubic root of 212249808 is about 596.5073079547.

The spelling of 212249808 in words is "two hundred twelve million, two hundred forty-nine thousand, eight hundred eight".