976721 has 2 divisors, whose sum is σ = 976722. Its totient is φ = 976720.

The previous prime is 976709. The next prime is 976727. The reversal of 976721 is 127679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 130321 = 920^2 + 361^2 .

It is an emirp because it is prime and its reverse (127679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 976721 - 2¹⁸ = 714577 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (976727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488360 + 488361.

It is an arithmetic number, because the mean of its divisors is an integer number (488361).

2⁹⁷⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

976721 is a deficient number, since it is larger than the sum of its proper divisors (1).

976721 is an equidigital number, since it uses as much as digits as its factorization.

976721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 976721 is about 988.2919609103. The cubic root of 976721 is about 99.2179329897.

The spelling of 976721 in words is "nine hundred seventy-six thousand, seven hundred twenty-one".