213522738 has 32 divisors (see below), whose sum is σ = 501705792. Its totient is φ = 59726400.

The previous prime is 213522719. The next prime is 213522763. The reversal of 213522738 is 837225312.

213522738 is digitally balanced in base 3, 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 (33).

It is a junction number, because it is equal to n+sod(n) for n = 213522699 and 213522708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123573 + ... + 125288.

It is an arithmetic number, because the mean of its divisors is an integer number (15678306).

Almost surely, 2^213522738 is an apocalyptic number.

213522738 is an abundant number, since it is smaller than the sum of its proper divisors (288183054).

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

213522738 is a wasteful number, since it uses less digits than its factorization.

213522738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248890.

The product of its digits is 20160, while the sum is 33.

The square root of 213522738 is about 14612.4172538290. The cubic root of 213522738 is about 597.6974136865.

It can be divided in two parts, 21352 and 2738, that added together give a triangular number (24090 = T₂₁₉).

The spelling of 213522738 in words is "two hundred thirteen million, five hundred twenty-two thousand, seven hundred thirty-eight".