1239980047 has 4 divisors (see below), whose sum is σ = 1240288560. Its totient is φ = 1239671536.

The previous prime is 1239980041. The next prime is 1239980059. The reversal of 1239980047 is 7400899321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7400899321 = 47 ⋅157465943.

It is a cyclic number.

It is not a de Polignac number, because 1239980047 - 2²⁷ = 1105762319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1239979985 and 1239980012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239980041) 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, 148147 + ... + 156292.

It is an arithmetic number, because the mean of its divisors is an integer number (310072140).

Almost surely, 2^1239980047 is an apocalyptic number.

1239980047 is a deficient number, since it is larger than the sum of its proper divisors (308513).

1239980047 is an equidigital number, since it uses as much as digits as its factorization.

1239980047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308512.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1239980047 is about 35213.3504086163. The cubic root of 1239980047 is about 1074.3313085259.

The spelling of 1239980047 in words is "one billion, two hundred thirty-nine million, nine hundred eighty thousand, forty-seven".