217453385 has 24 divisors (see below), whose sum is σ = 287206080. Its totient is φ = 157604832.

The previous prime is 217453373. The next prime is 217453393. The reversal of 217453385 is 583354712.

217453385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217453385 - 2²⁶ = 150344521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48092 + ... + 52418.

It is an arithmetic number, because the mean of its divisors is an integer number (11966920).

Almost surely, 2^217453385 is an apocalyptic number.

It is an amenable number.

217453385 is a deficient number, since it is larger than the sum of its proper divisors (69752695).

217453385 is a wasteful number, since it uses less digits than its factorization.

217453385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4374 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 217453385 is about 14746.3007225541. The cubic root of 217453385 is about 601.3427197830.

The spelling of 217453385 in words is "two hundred seventeen million, four hundred fifty-three thousand, three hundred eighty-five".