209431039 has 8 divisors (see below), whose sum is σ = 211127040. Its totient is φ = 207740376.

The previous prime is 209431021. The next prime is 209431073. The reversal of 209431039 is 930134902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209431039 - 2⁹ = 209430527 is a prime.

It is a super-2 number, since 2×209431039² = 87722720193239042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209431039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209431139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116304 + ... + 118090.

It is an arithmetic number, because the mean of its divisors is an integer number (26390880).

Almost surely, 2^209431039 is an apocalyptic number.

209431039 is a deficient number, since it is larger than the sum of its proper divisors (1696001).

209431039 is a wasteful number, since it uses less digits than its factorization.

209431039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 209431039 is about 14471.7324118434. The cubic root of 209431039 is about 593.8549066122.

It can be divided in two parts, 2094 and 31039, that added together give a palindrome (33133).

The spelling of 209431039 in words is "two hundred nine million, four hundred thirty-one thousand, thirty-nine".