212547540 has 48 divisors (see below), whose sum is σ = 597643200. Its totient is φ = 56440320.

The previous prime is 212547527. The next prime is 212547571. The reversal of 212547540 is 45745212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 212547498 and 212547507.

It is a congruent number.

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, 7111 + ... + 21809.

It is an arithmetic number, because the mean of its divisors is an integer number (12450900).

Almost surely, 2^212547540 is an apocalyptic number.

212547540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212547540 is an abundant number, since it is smaller than the sum of its proper divisors (385095660).

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

212547540 is a wasteful number, since it uses less digits than its factorization.

212547540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14952 (or 14950 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 212547540 is about 14579.0102544720. The cubic root of 212547540 is about 596.7860931875.

The spelling of 212547540 in words is "two hundred twelve million, five hundred forty-seven thousand, five hundred forty".