216997443 has 12 divisors (see below), whose sum is σ = 337551760. Its totient is φ = 133536816.

The previous prime is 216997411. The next prime is 216997453. The reversal of 216997443 is 344799612.

It is a happy number.

It is not a de Polignac number, because 216997443 - 2⁵ = 216997411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216997453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 927223 + ... + 927456.

Almost surely, 2^216997443 is an apocalyptic number.

216997443 is a deficient number, since it is larger than the sum of its proper divisors (120554317).

216997443 is a wasteful number, since it uses less digits than its factorization.

216997443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854698 (or 1854695 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 216997443 is about 14730.8330721653. The cubic root of 216997443 is about 600.9221403692.

The spelling of 216997443 in words is "two hundred sixteen million, nine hundred ninety-seven thousand, four hundred forty-three".