216430439 has 4 divisors (see below), whose sum is σ = 217681656. Its totient is φ = 215179224.

The previous prime is 216430399. The next prime is 216430453. The reversal of 216430439 is 934034612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216430439 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 (216430139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625349 + ... + 625694.

It is an arithmetic number, because the mean of its divisors is an integer number (54420414).

Almost surely, 2^216430439 is an apocalyptic number.

216430439 is a deficient number, since it is larger than the sum of its proper divisors (1251217).

216430439 is a wasteful number, since it uses less digits than its factorization.

216430439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251216.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 216430439 is about 14711.5750006585. The cubic root of 216430439 is about 600.3982901793.

The spelling of 216430439 in words is "two hundred sixteen million, four hundred thirty thousand, four hundred thirty-nine".