972921 has 16 divisors (see below), whose sum is σ = 1373760. Its totient is φ = 611520.

The previous prime is 972901. The next prime is 972941. The reversal of 972921 is 129279.

It is an interprime number because it is at equal distance from previous prime (972901) and next prime (972941).

It is not a de Polignac number, because 972921 - 2⁷ = 972793 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 972921.

It is not an unprimeable number, because it can be changed into a prime (972901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4506 + ... + 4716.

It is an arithmetic number, because the mean of its divisors is an integer number (85860).

2⁹⁷²⁹²¹ is an apocalyptic number.

It is an amenable number.

972921 is a deficient number, since it is larger than the sum of its proper divisors (400839).

972921 is a wasteful number, since it uses less digits than its factorization.

972921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 2268, while the sum is 30.

The square root of 972921 is about 986.3675785426. The cubic root of 972921 is about 99.0890943701.

The spelling of 972921 in words is "nine hundred seventy-two thousand, nine hundred twenty-one".