212647842 has 56 divisors (see below), whose sum is σ = 521754480. Its totient is φ = 64433880.

The previous prime is 212647793. The next prime is 212647873. The reversal of 212647842 is 248746212.

212647842 is a `hidden beast` number, since 2 + 1 + 2 + 647 + 8 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 212647797 and 212647806.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 9409 + ... + 22667.

Almost surely, 2^212647842 is an apocalyptic number.

212647842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 212647842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260877240).

212647842 is an abundant number, since it is smaller than the sum of its proper divisors (309106638).

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

212647842 is a wasteful number, since it uses less digits than its factorization.

212647842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13290 (or 13275 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 212647842 is about 14582.4497941875. The cubic root of 212647842 is about 596.8799536407.

The spelling of 212647842 in words is "two hundred twelve million, six hundred forty-seven thousand, eight hundred forty-two".