212278840 has 32 divisors (see below), whose sum is σ = 494100000. Its totient is φ = 81983104.

The previous prime is 212278789. The next prime is 212278861. The reversal of 212278840 is 48872212.

212278840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212278796 and 212278805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90340 + ... + 92659.

It is an arithmetic number, because the mean of its divisors is an integer number (15440625).

Almost surely, 2^212278840 is an apocalyptic number.

212278840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212278840 is an abundant number, since it is smaller than the sum of its proper divisors (281821160).

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

212278840 is a wasteful number, since it uses less digits than its factorization.

212278840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183039 (or 183035 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 212278840 is about 14569.7920369510. The cubic root of 212278840 is about 596.5345039128.

The spelling of 212278840 in words is "two hundred twelve million, two hundred seventy-eight thousand, eight hundred forty".