139843240 has 16 divisors (see below), whose sum is σ = 314647380. Its totient is φ = 55937280.

The previous prime is 139843237. The next prime is 139843247. The reversal of 139843240 is 42348931.

It can be written as a sum of positive squares in 2 ways, for example, as 133217764 + 6625476 = 11542^2 + 2574^2 .

It is a super-2 number, since 2×139843240² = 39112263547395200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139843196 and 139843205.

It is not an unprimeable number, because it can be changed into a prime (139843247) 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, 1748001 + ... + 1748080.

Almost surely, 2^139843240 is an apocalyptic number.

139843240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139843240 is an abundant number, since it is smaller than the sum of its proper divisors (174804140).

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

139843240 is a wasteful number, since it uses less digits than its factorization.

139843240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496092 (or 3496088 counting only the distinct ones).

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

The square root of 139843240 is about 11825.5333917756. The cubic root of 139843240 is about 519.0555341444.

The spelling of 139843240 in words is "one hundred thirty-nine million, eight hundred forty-three thousand, two hundred forty".