216475 has 12 divisors (see below), whose sum is σ = 307024. Its totient is φ = 148320.

The previous prime is 216451. The next prime is 216481. The reversal of 216475 is 574612.

It is not a de Polignac number, because 216475 - 2⁷ = 216347 is a prime.

It is a super-2 number, since 2×216475² = 93722851250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

216475 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444 + ... + 793.

2²¹⁶⁴⁷⁵ is an apocalyptic number.

216475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216475 is a deficient number, since it is larger than the sum of its proper divisors (90549).

216475 is a wasteful number, since it uses less digits than its factorization.

216475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1249 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 216475 is about 465.2687395474. The cubic root of 216475 is about 60.0439492813.

The spelling of 216475 in words is "two hundred sixteen thousand, four hundred seventy-five".