97724399 has 2 divisors, whose sum is σ = 97724400. Its totient is φ = 97724398.

The previous prime is 97724387. The next prime is 97724453. The reversal of 97724399 is 99342779.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97724399 - 2¹² = 97720303 is a prime.

It is a super-2 number, since 2×97724399² = 19100116319822402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97724339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48862199 + 48862200.

It is an arithmetic number, because the mean of its divisors is an integer number (48862200).

Almost surely, 2^97724399 is an apocalyptic number.

97724399 is a deficient number, since it is larger than the sum of its proper divisors (1).

97724399 is an equidigital number, since it uses as much as digits as its factorization.

97724399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 97724399 is about 9885.5651836402. The cubic root of 97724399 is about 460.6110326619.

The spelling of 97724399 in words is "ninety-seven million, seven hundred twenty-four thousand, three hundred ninety-nine".