97826021 has 4 divisors (see below), whose sum is σ = 98691852. Its totient is φ = 96960192.

The previous prime is 97826009. The next prime is 97826023. The reversal of 97826021 is 12062879.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1020100 + 96805921 = 1010^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 97826021 - 2⁶ = 97825957 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 (97826023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432746 + ... + 432971.

It is an arithmetic number, because the mean of its divisors is an integer number (24672963).

Almost surely, 2^97826021 is an apocalyptic number.

It is an amenable number.

97826021 is a deficient number, since it is larger than the sum of its proper divisors (865831).

97826021 is a wasteful number, since it uses less digits than its factorization.

97826021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865830.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 97826021 is about 9890.7037666690. The cubic root of 97826021 is about 460.7706379709.

The spelling of 97826021 in words is "ninety-seven million, eight hundred twenty-six thousand, twenty-one".