139042209 has 16 divisors (see below), whose sum is σ = 196239680. Its totient is φ = 87324480.

The previous prime is 139042187. The next prime is 139042231. The reversal of 139042209 is 902240931.

It is an interprime number because it is at equal distance from previous prime (139042187) and next prime (139042231).

It is not a de Polignac number, because 139042209 - 2¹² = 139038113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139042249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3579 + ... + 17055.

It is an arithmetic number, because the mean of its divisors is an integer number (12264980).

Almost surely, 2^139042209 is an apocalyptic number.

139042209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

139042209 is a deficient number, since it is larger than the sum of its proper divisors (57197471).

139042209 is a wasteful number, since it uses less digits than its factorization.

139042209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13680.

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

The square root of 139042209 is about 11791.6160470056. The cubic root of 139042209 is about 518.0625747416.

The spelling of 139042209 in words is "one hundred thirty-nine million, forty-two thousand, two hundred nine".