1173872921 has 8 divisors (see below), whose sum is σ = 1268240064. Its totient is φ = 1080087120.

The previous prime is 1173872881. The next prime is 1173872971. The reversal of 1173872921 is 1292783711.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1173872921 - 2⁶ = 1173872857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1173872971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141131 + ... + 149216.

It is an arithmetic number, because the mean of its divisors is an integer number (158530008).

Almost surely, 2^1173872921 is an apocalyptic number.

It is an amenable number.

1173872921 is a deficient number, since it is larger than the sum of its proper divisors (94367143).

1173872921 is a wasteful number, since it uses less digits than its factorization.

1173872921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290671.

The product of its digits is 42336, while the sum is 41.

The square root of 1173872921 is about 34261.8289208267. The cubic root of 1173872921 is about 1054.8896423277.

The spelling of 1173872921 in words is "one billion, one hundred seventy-three million, eight hundred seventy-two thousand, nine hundred twenty-one".