1129878047 has 4 divisors (see below), whose sum is σ = 1130378280. Its totient is φ = 1129377816.

The previous prime is 1129878023. The next prime is 1129878121. The reversal of 1129878047 is 7408789211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7408789211 = 47 ⋅157633813.

It is a cyclic number.

It is not a de Polignac number, because 1129878047 - 2²² = 1125683743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1129877992 and 1129878010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129878007) 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, 246713 + ... + 251250.

It is an arithmetic number, because the mean of its divisors is an integer number (282594570).

Almost surely, 2^1129878047 is an apocalyptic number.

1129878047 is a deficient number, since it is larger than the sum of its proper divisors (500233).

1129878047 is an equidigital number, since it uses as much as digits as its factorization.

1129878047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500232.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 1129878047 is about 33613.6586375241. The cubic root of 1129878047 is about 1041.5429657936.

The spelling of 1129878047 in words is "one billion, one hundred twenty-nine million, eight hundred seventy-eight thousand, forty-seven".