217964157 has 8 divisors (see below), whose sum is σ = 307714176. Its totient is φ = 136761792.

The previous prime is 217964129. The next prime is 217964177. The reversal of 217964157 is 751469712.

It is a happy number.

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

It is not a de Polignac number, because 217964157 - 2⁸ = 217963901 is a prime.

It is a super-3 number, since 3×217964157³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217964177) 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, 2136853 + ... + 2136954.

It is an arithmetic number, because the mean of its divisors is an integer number (38464272).

Almost surely, 2^217964157 is an apocalyptic number.

It is an amenable number.

217964157 is a deficient number, since it is larger than the sum of its proper divisors (89750019).

217964157 is a wasteful number, since it uses less digits than its factorization.

217964157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273827.

The product of its digits is 105840, while the sum is 42.

The square root of 217964157 is about 14763.6092131972. The cubic root of 217964157 is about 601.8131790059.

The spelling of 217964157 in words is "two hundred seventeen million, nine hundred sixty-four thousand, one hundred fifty-seven".