213087138 has 16 divisors (see below), whose sum is σ = 464917536. Its totient is φ = 64571840.

The previous prime is 213087131. The next prime is 213087179. The reversal of 213087138 is 831780312.

It is a super-2 number, since 2×213087138² = 90812256762062088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213087099 and 213087108.

It is not an unprimeable number, because it can be changed into a prime (213087131) 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, 1614231 + ... + 1614362.

It is an arithmetic number, because the mean of its divisors is an integer number (29057346).

Almost surely, 2^213087138 is an apocalyptic number.

213087138 is an abundant number, since it is smaller than the sum of its proper divisors (251830398).

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

213087138 is a wasteful number, since it uses less digits than its factorization.

213087138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228609.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 213087138 is about 14597.5045127583. The cubic root of 213087138 is about 597.2906900356.

The spelling of 213087138 in words is "two hundred thirteen million, eighty-seven thousand, one hundred thirty-eight".