213914639 has 4 divisors (see below), whose sum is σ = 214260840. Its totient is φ = 213568440.

The previous prime is 213914611. The next prime is 213914641. The reversal of 213914639 is 936419312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213914639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213914339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172172 + ... + 173409.

It is an arithmetic number, because the mean of its divisors is an integer number (53565210).

Almost surely, 2^213914639 is an apocalyptic number.

213914639 is a deficient number, since it is larger than the sum of its proper divisors (346201).

213914639 is an equidigital number, since it uses as much as digits as its factorization.

213914639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346200.

The product of its digits is 34992, while the sum is 38.

The square root of 213914639 is about 14625.8209684106. The cubic root of 213914639 is about 598.0628627480.

The spelling of 213914639 in words is "two hundred thirteen million, nine hundred fourteen thousand, six hundred thirty-nine".