97740821 has 8 divisors (see below), whose sum is σ = 98620440. Its totient is φ = 96864768.

The previous prime is 97740809. The next prime is 97740829. The reversal of 97740821 is 12804779.

It can be written as a sum of positive squares in 4 ways, for example, as 1406596 + 96334225 = 1186^2 + 9815^2 .

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 97740821 - 2¹⁸ = 97478677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97740829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96365 + ... + 97373.

It is an arithmetic number, because the mean of its divisors is an integer number (12327555).

Almost surely, 2^97740821 is an apocalyptic number.

It is an amenable number.

97740821 is a deficient number, since it is larger than the sum of its proper divisors (879619).

97740821 is a wasteful number, since it uses less digits than its factorization.

97740821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 97740821 is about 9886.3957537618. The cubic root of 97740821 is about 460.6368321920.

The spelling of 97740821 in words is "ninety-seven million, seven hundred forty thousand, eight hundred twenty-one".