212547478 has 16 divisors (see below), whose sum is σ = 374559696. Its totient is φ = 89180640.

The previous prime is 212547473. The next prime is 212547487. The reversal of 212547478 is 874745212.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 212547478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212547473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371301 + ... + 371872.

It is an arithmetic number, because the mean of its divisors is an integer number (23409981).

Almost surely, 2^212547478 is an apocalyptic number.

212547478 is a deficient number, since it is larger than the sum of its proper divisors (162012218).

212547478 is a wasteful number, since it uses less digits than its factorization.

212547478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743199.

The product of its digits is 125440, while the sum is 40.

The square root of 212547478 is about 14579.0081281272. The cubic root of 212547478 is about 596.7860351601.

The spelling of 212547478 in words is "two hundred twelve million, five hundred forty-seven thousand, four hundred seventy-eight".