139809236 has 24 divisors (see below), whose sum is σ = 287177856. Its totient is φ = 58298400.

The previous prime is 139809217. The next prime is 139809247. The reversal of 139809236 is 632908931.

It is a junction number, because it is equal to n+sod(n) for n = 139809193 and 139809202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66440 + ... + 68511.

It is an arithmetic number, because the mean of its divisors is an integer number (11965744).

Almost surely, 2^139809236 is an apocalyptic number.

It is an amenable number.

139809236 is an abundant number, since it is smaller than the sum of its proper divisors (147368620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139809236 is a wasteful number, since it uses less digits than its factorization.

139809236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134999 (or 134997 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 139809236 is about 11824.0955679494. The cubic root of 139809236 is about 519.0134599019.

The spelling of 139809236 in words is "one hundred thirty-nine million, eight hundred nine thousand, two hundred thirty-six".