974380921 has 4 divisors (see below), whose sum is σ = 974470644. Its totient is φ = 974291200.

The previous prime is 974380861. The next prime is 974380931. The reversal of 974380921 is 129083479.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 164352400 + 810028521 = 12820^2 + 28461^2 .

It is a cyclic number.

It is not a de Polignac number, because 974380921 - 2⁷ = 974380793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (974380931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25900 + ... + 51181.

It is an arithmetic number, because the mean of its divisors is an integer number (243617661).

It is a 10860-hyperperfect number.

Almost surely, 2^974380921 is an apocalyptic number.

It is an amenable number.

974380921 is a deficient number, since it is larger than the sum of its proper divisors (89723).

974380921 is a wasteful number, since it uses less digits than its factorization.

974380921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89722.

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

The square root of 974380921 is about 31215.0752201560. The cubic root of 974380921 is about 991.3863246283.

The spelling of 974380921 in words is "nine hundred seventy-four million, three hundred eighty thousand, nine hundred twenty-one".