139243240 has 32 divisors (see below), whose sum is σ = 314114760. Its totient is φ = 55552000.

The previous prime is 139243231. The next prime is 139243241. The reversal of 139243240 is 42342931.

It can be written as a sum of positive squares in 4 ways, for example, as 138815524 + 427716 = 11782^2 + 654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139243199 and 139243208.

It is not an unprimeable number, because it can be changed into a prime (139243241) 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 7 ways as a sum of consecutive naturals, for example, 11700 + ... + 20380.

Almost surely, 2^139243240 is an apocalyptic number.

139243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139243240 is an abundant number, since it is smaller than the sum of its proper divisors (174871520).

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

139243240 is a wasteful number, since it uses less digits than its factorization.

139243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9093 (or 9089 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 139243240 is about 11800.1372873370. The cubic root of 139243240 is about 518.3121308196.

The spelling of 139243240 in words is "one hundred thirty-nine million, two hundred forty-three thousand, two hundred forty".