209943424 has 16 divisors (see below), whose sum is σ = 418246920. Its totient is φ = 104971648.

The previous prime is 209943413. The next prime is 209943431. The reversal of 209943424 is 424349902.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819964 + ... + 820219.

Almost surely, 2^209943424 is an apocalyptic number.

It is an amenable number.

209943424 is a deficient number, since it is larger than the sum of its proper divisors (208303496).

209943424 is an equidigital number, since it uses as much as digits as its factorization.

209943424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640197 (or 1640185 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 209943424 is about 14489.4245572417. The cubic root of 209943424 is about 594.3388121760.

The spelling of 209943424 in words is "two hundred nine million, nine hundred forty-three thousand, four hundred twenty-four".