217107387 has 54 divisors (see below), whose sum is σ = 376804428. Its totient is φ = 120043728.

The previous prime is 217107367. The next prime is 217107409. The reversal of 217107387 is 783701712.

It is a happy number.

It is not a de Polignac number, because 217107387 - 2²³ = 208718779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217107367) 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 53 ways as a sum of consecutive naturals, for example, 2028988 + ... + 2029094.

Almost surely, 2^217107387 is an apocalyptic number.

217107387 is a deficient number, since it is larger than the sum of its proper divisors (159697041).

217107387 is a wasteful number, since it uses less digits than its factorization.

217107387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 217107387 is about 14734.5643641066. The cubic root of 217107387 is about 601.0236110410.

The spelling of 217107387 in words is "two hundred seventeen million, one hundred seven thousand, three hundred eighty-seven".