139384240 has 20 divisors (see below), whose sum is σ = 324068544. Its totient is φ = 55753664.

The previous prime is 139384181. The next prime is 139384249. The reversal of 139384240 is 42483931.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 139384196 and 139384205.

It is not an unprimeable number, because it can be changed into a prime (139384249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871072 + ... + 871231.

Almost surely, 2^139384240 is an apocalyptic number.

139384240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139384240 is an abundant number, since it is smaller than the sum of its proper divisors (184684304).

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

139384240 is a wasteful number, since it uses less digits than its factorization.

139384240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742316 (or 1742310 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 139384240 is about 11806.1102823919. The cubic root of 139384240 is about 518.4870222693.

The spelling of 139384240 in words is "one hundred thirty-nine million, three hundred eighty-four thousand, two hundred forty".