209024139 has 4 divisors (see below), whose sum is σ = 278698856. Its totient is φ = 139349424.

The previous prime is 209024119. The next prime is 209024159. The reversal of 209024139 is 931420902.

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

It is an interprime number because it is at equal distance from previous prime (209024119) and next prime (209024159).

It is not a de Polignac number, because 209024139 - 2⁹ = 209023627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209024119) 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, 34837354 + ... + 34837359.

It is an arithmetic number, because the mean of its divisors is an integer number (69674714).

Almost surely, 2^209024139 is an apocalyptic number.

209024139 is a deficient number, since it is larger than the sum of its proper divisors (69674717).

209024139 is an equidigital number, since it uses as much as digits as its factorization.

209024139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69674716.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 209024139 is about 14457.6671354683. The cubic root of 209024139 is about 593.4700604049.

The spelling of 209024139 in words is "two hundred nine million, twenty-four thousand, one hundred thirty-nine".