212688940 has 12 divisors (see below), whose sum is σ = 446646816. Its totient is φ = 85075568.

The previous prime is 212688901. The next prime is 212688941. The reversal of 212688940 is 49886212.

It is a junction number, because it is equal to n+sod(n) for n = 212688893 and 212688902.

It is not an unprimeable number, because it can be changed into a prime (212688941) 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, 5317204 + ... + 5317243.

It is an arithmetic number, because the mean of its divisors is an integer number (37220568).

Almost surely, 2^212688940 is an apocalyptic number.

212688940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212688940 is an abundant number, since it is smaller than the sum of its proper divisors (233957876).

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

212688940 is a wasteful number, since it uses less digits than its factorization.

212688940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634456 (or 10634454 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 212688940 is about 14583.8588857682. The cubic root of 212688940 is about 596.9184037404.

The spelling of 212688940 in words is "two hundred twelve million, six hundred eighty-eight thousand, nine hundred forty".