213509538 has 24 divisors (see below), whose sum is σ = 504659376. Its totient is φ = 64699800.

The previous prime is 213509521. The next prime is 213509551. The reversal of 213509538 is 835905312.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538968 + ... + 539363.

It is an arithmetic number, because the mean of its divisors is an integer number (21027474).

Almost surely, 2^213509538 is an apocalyptic number.

213509538 is an abundant number, since it is smaller than the sum of its proper divisors (291149838).

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

213509538 is a wasteful number, since it uses less digits than its factorization.

213509538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078350 (or 1078347 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 213509538 is about 14611.9655761982. The cubic root of 213509538 is about 597.6850968586.

The spelling of 213509538 in words is "two hundred thirteen million, five hundred nine thousand, five hundred thirty-eight".