212178492 has 72 divisors (see below), whose sum is σ = 554299200. Its totient is φ = 68395008.

The previous prime is 212178487. The next prime is 212178493. The reversal of 212178492 is 294871212.

212178492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212178493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149884 + ... + 151292.

It is an arithmetic number, because the mean of its divisors is an integer number (7698600).

Almost surely, 2^212178492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212178492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277149600).

212178492 is an abundant number, since it is smaller than the sum of its proper divisors (342120708).

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

212178492 is a wasteful number, since it uses less digits than its factorization.

212178492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555 (or 1550 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 212178492 is about 14566.3479293885. The cubic root of 212178492 is about 596.4404915918.

The spelling of 212178492 in words is "two hundred twelve million, one hundred seventy-eight thousand, four hundred ninety-two".