216439375 has 10 divisors (see below), whose sum is σ = 270463424. Its totient is φ = 173151000.

The previous prime is 216439373. The next prime is 216439397. The reversal of 216439375 is 573934612.

It is a happy number.

It is not a de Polignac number, because 216439375 - 2¹ = 216439373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216439373) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 172527 + ... + 173776.

Almost surely, 2^216439375 is an apocalyptic number.

216439375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216439375 is a deficient number, since it is larger than the sum of its proper divisors (54024049).

216439375 is an frugal number, since it uses more digits than its factorization.

216439375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346323 (or 346308 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 216439375 is about 14711.8787039589. The cubic root of 216439375 is about 600.4065531657.

The spelling of 216439375 in words is "two hundred sixteen million, four hundred thirty-nine thousand, three hundred seventy-five".