139403423 has 2 divisors, whose sum is σ = 139403424. Its totient is φ = 139403422.

The previous prime is 139403419. The next prime is 139403441. The reversal of 139403423 is 324304931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139403423 - 2² = 139403419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139403443) 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 as a sum of consecutive naturals, namely, 69701711 + 69701712.

It is an arithmetic number, because the mean of its divisors is an integer number (69701712).

Almost surely, 2^139403423 is an apocalyptic number.

139403423 is a deficient number, since it is larger than the sum of its proper divisors (1).

139403423 is an equidigital number, since it uses as much as digits as its factorization.

139403423 is an odious number, because the sum of its binary digits is odd.

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

The square root of 139403423 is about 11806.9226727374. The cubic root of 139403423 is about 518.5108070728.

The spelling of 139403423 in words is "one hundred thirty-nine million, four hundred three thousand, four hundred twenty-three".