213738917 has 8 divisors (see below), whose sum is σ = 244391616. Its totient is φ = 183115872.

The previous prime is 213738913. The next prime is 213738919. The reversal of 213738917 is 719837312.

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

It is a cyclic number.

It is not a de Polignac number, because 213738917 - 2² = 213738913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213738913) 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, 11138 + ... + 23484.

It is an arithmetic number, because the mean of its divisors is an integer number (30548952).

Almost surely, 2^213738917 is an apocalyptic number.

It is an amenable number.

213738917 is a deficient number, since it is larger than the sum of its proper divisors (30652699).

213738917 is a wasteful number, since it uses less digits than its factorization.

213738917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14827.

The product of its digits is 63504, while the sum is 41.

The square root of 213738917 is about 14619.8124816976. The cubic root of 213738917 is about 597.8990566110.

The spelling of 213738917 in words is "two hundred thirteen million, seven hundred thirty-eight thousand, nine hundred seventeen".