213758649 has 16 divisors (see below), whose sum is σ = 341040000. Its totient is φ = 131543568.

The previous prime is 213758639. The next prime is 213758669. The reversal of 213758649 is 946857312.

213758649 is a `hidden beast` number, since 21 + 3 + 7 + 586 + 49 = 666.

It is not a de Polignac number, because 213758649 - 2⁸ = 213758393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213758639) by changing a digit.

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, 304149 + ... + 304850.

It is an arithmetic number, because the mean of its divisors is an integer number (21315000).

Almost surely, 2^213758649 is an apocalyptic number.

It is an amenable number.

213758649 is a deficient number, since it is larger than the sum of its proper divisors (127281351).

213758649 is a wasteful number, since it uses less digits than its factorization.

213758649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609021 (or 609015 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213758649 is about 14620.4873037803. The cubic root of 213758649 is about 597.9174550404.

The spelling of 213758649 in words is "two hundred thirteen million, seven hundred fifty-eight thousand, six hundred forty-nine".