139430243 has 16 divisors (see below), whose sum is σ = 150172704. Its totient is φ = 128993280.

The previous prime is 139430237. The next prime is 139430251. The reversal of 139430243 is 342034931.

It is a de Polignac number, because none of the positive numbers 2^k-139430243 is a prime.

It is a super-3 number, since 3×139430243³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139430143) 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 15 ways as a sum of consecutive naturals, for example, 304871 + ... + 305327.

It is an arithmetic number, because the mean of its divisors is an integer number (9385794).

Almost surely, 2^139430243 is an apocalyptic number.

139430243 is a deficient number, since it is larger than the sum of its proper divisors (10742461).

139430243 is a wasteful number, since it uses less digits than its factorization.

139430243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 139430243 is about 11808.0583924708. The cubic root of 139430243 is about 518.5440572562.

The spelling of 139430243 in words is "one hundred thirty-nine million, four hundred thirty thousand, two hundred forty-three".