970921 has 16 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 760320.

The previous prime is 970909. The next prime is 970927. The reversal of 970921 is 129079.

970921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

970921 is a nontrivial binomial coefficient, being equal to C(1394, 2).

It is a cyclic number.

It is not a de Polignac number, because 970921 - 2⁷ = 970793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 970921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (970927) 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, 4780 + ... + 4978.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2⁹⁷⁰⁹²¹ is an apocalyptic number.

970921 is the 1393-rd triangular number and also the 697-th hexagonal number.

970921 is the 465-th centered nonagonal number.

It is an amenable number.

970921 is a deficient number, since it is larger than the sum of its proper divisors (238679).

970921 is a wasteful number, since it uses less digits than its factorization.

970921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 970921 is about 985.3532361544. The cubic root of 970921 is about 99.0211497853.

It can be divided in two parts, 9709 and 21, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 970921 in words is "nine hundred seventy thousand, nine hundred twenty-one".