213234639 has 8 divisors (see below), whose sum is σ = 284825520. Its totient is φ = 141900096.

The previous prime is 213234599. The next prime is 213234641. The reversal of 213234639 is 936432312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-213234639 is a prime.

It is a super-2 number, since 2×213234639² = 90938022538920642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213234839) 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, 62134 + ... + 65475.

It is an arithmetic number, because the mean of its divisors is an integer number (35603190).

Almost surely, 2^213234639 is an apocalyptic number.

213234639 is a deficient number, since it is larger than the sum of its proper divisors (71590881).

213234639 is a wasteful number, since it uses less digits than its factorization.

213234639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128169.

The product of its digits is 23328, while the sum is 33.

The square root of 213234639 is about 14602.5559064158. Note that the first 3 decimals coincide. The cubic root of 213234639 is about 597.4284750666.

The spelling of 213234639 in words is "two hundred thirteen million, two hundred thirty-four thousand, six hundred thirty-nine".