213879138 has 32 divisors (see below), whose sum is σ = 467387712. Its totient is φ = 64708800.

The previous prime is 213879103. The next prime is 213879151. The reversal of 213879138 is 831978312.

It is a self number, because there is not a number n which added to its sum of digits gives 213879138.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46168 + ... + 50588.

It is an arithmetic number, because the mean of its divisors is an integer number (14605866).

Almost surely, 2^213879138 is an apocalyptic number.

213879138 is an abundant number, since it is smaller than the sum of its proper divisors (253508574).

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

213879138 is a wasteful number, since it uses less digits than its factorization.

213879138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170.

The product of its digits is 72576, while the sum is 42.

The square root of 213879138 is about 14624.6072767784. The cubic root of 213879138 is about 598.0297763349.

The spelling of 213879138 in words is "two hundred thirteen million, eight hundred seventy-nine thousand, one hundred thirty-eight".