139240263 has 4 divisors (see below), whose sum is σ = 185653688. Its totient is φ = 92826840.

The previous prime is 139240237. The next prime is 139240267. The reversal of 139240263 is 362042931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139240263 - 2²⁰ = 138191687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139240263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139240267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23206708 + ... + 23206713.

It is an arithmetic number, because the mean of its divisors is an integer number (46413422).

Almost surely, 2^139240263 is an apocalyptic number.

139240263 is a deficient number, since it is larger than the sum of its proper divisors (46413425).

139240263 is an equidigital number, since it uses as much as digits as its factorization.

139240263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46413424.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 139240263 is about 11800.0111440625. The cubic root of 139240263 is about 518.3084369809.

The spelling of 139240263 in words is "one hundred thirty-nine million, two hundred forty thousand, two hundred sixty-three".