139663429 has 4 divisors (see below), whose sum is σ = 145735776. Its totient is φ = 133591084.

The previous prime is 139663421. The next prime is 139663451. The reversal of 139663429 is 924366931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924366931 = 7753 ⋅119227.

It is not a de Polignac number, because 139663429 - 2³ = 139663421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139663421) 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, 3036139 + ... + 3036184.

It is an arithmetic number, because the mean of its divisors is an integer number (36433944).

Almost surely, 2^139663429 is an apocalyptic number.

It is an amenable number.

139663429 is a deficient number, since it is larger than the sum of its proper divisors (6072347).

139663429 is an equidigital number, since it uses as much as digits as its factorization.

139663429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072346.

The product of its digits is 209952, while the sum is 43.

The square root of 139663429 is about 11817.9282871407. The cubic root of 139663429 is about 518.8329708289.

The spelling of 139663429 in words is "one hundred thirty-nine million, six hundred sixty-three thousand, four hundred twenty-nine".