1172920321 has 8 divisors (see below), whose sum is σ = 1242777600. Its totient is φ = 1103158848.

The previous prime is 1172920319. The next prime is 1172920327. The reversal of 1172920321 is 1230292711.

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 1172920321 - 2¹ = 1172920319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1172920321.

It is not an unprimeable number, because it can be changed into a prime (1172920327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2080 + ... + 48478.

It is an arithmetic number, because the mean of its divisors is an integer number (155347200).

Almost surely, 2^1172920321 is an apocalyptic number.

It is an amenable number.

1172920321 is a deficient number, since it is larger than the sum of its proper divisors (69857279).

1172920321 is a wasteful number, since it uses less digits than its factorization.

1172920321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47903.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1172920321 is about 34247.9243312642. The cubic root of 1172920321 is about 1054.6042168213.

The spelling of 1172920321 in words is "one billion, one hundred seventy-two million, nine hundred twenty thousand, three hundred twenty-one".