97439939 has 2 divisors, whose sum is σ = 97439940. Its totient is φ = 97439938.

The previous prime is 97439921. The next prime is 97439963. The reversal of 97439939 is 93993479.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97439939 - 2²⁰ = 96391363 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97439989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48719969 + 48719970.

It is an arithmetic number, because the mean of its divisors is an integer number (48719970).

Almost surely, 2^97439939 is an apocalyptic number.

97439939 is a deficient number, since it is larger than the sum of its proper divisors (1).

97439939 is an equidigital number, since it uses as much as digits as its factorization.

97439939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1653372, while the sum is 53.

The square root of 97439939 is about 9871.1670535960. The cubic root of 97439939 is about 460.1636767884.

The spelling of 97439939 in words is "ninety-seven million, four hundred thirty-nine thousand, nine hundred thirty-nine".