212556740 has 48 divisors (see below), whose sum is σ = 498294720. Its totient is φ = 75492480.

The previous prime is 212556737. The next prime is 212556761. The reversal of 212556740 is 47655212.

It is a junction number, because it is equal to n+sod(n) for n = 212556697 and 212556706.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775 + ... + 20694.

It is an arithmetic number, because the mean of its divisors is an integer number (10381140).

Almost surely, 2^212556740 is an apocalyptic number.

212556740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212556740 is an abundant number, since it is smaller than the sum of its proper divisors (285737980).

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

212556740 is a wasteful number, since it uses less digits than its factorization.

212556740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22532 (or 22530 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 212556740 is about 14579.3257731625. The cubic root of 212556740 is about 596.7947035794.

The spelling of 212556740 in words is "two hundred twelve million, five hundred fifty-six thousand, seven hundred forty".