139869909 has 20 divisors (see below), whose sum is σ = 209889504. Its totient is φ = 92823624.

The previous prime is 139869907. The next prime is 139869911. The reversal of 139869909 is 909968931.

It is an interprime number because it is at equal distance from previous prime (139869907) and next prime (139869911).

It is not a de Polignac number, because 139869909 - 2¹ = 139869907 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139869907) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14584 + ... + 22190.

Almost surely, 2^139869909 is an apocalyptic number.

It is an amenable number.

139869909 is a deficient number, since it is larger than the sum of its proper divisors (70019595).

139869909 is an equidigital number, since it uses as much as digits as its factorization.

139869909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846 (or 7837 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 139869909 is about 11826.6609404345. The cubic root of 139869909 is about 519.0885277835.

The spelling of 139869909 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, nine hundred nine".