213638705 has 16 divisors (see below), whose sum is σ = 297959040. Its totient is φ = 144010752.

The previous prime is 213638699. The next prime is 213638713. The reversal of 213638705 is 507836312.

It is a cyclic number.

It is not a de Polignac number, because 213638705 - 2¹⁶ = 213573169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49664 + ... + 53793.

It is an arithmetic number, because the mean of its divisors is an integer number (18622440).

Almost surely, 2^213638705 is an apocalyptic number.

It is an amenable number.

213638705 is a deficient number, since it is larger than the sum of its proper divisors (84320335).

213638705 is a wasteful number, since it uses less digits than its factorization.

213638705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103528.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 213638705 is about 14616.3848129419. The cubic root of 213638705 is about 597.8055998717.

The spelling of 213638705 in words is "two hundred thirteen million, six hundred thirty-eight thousand, seven hundred five".