39640123 has 2 divisors, whose sum is σ = 39640124. Its totient is φ = 39640122.

The previous prime is 39640121. The next prime is 39640127. The reversal of 39640123 is 32104693.

It is a weak prime.

It is an emirp because it is prime and its reverse (32104693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39640123 - 2¹ = 39640121 is a prime.

Together with 39640121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 39640091 and 39640100.

It is not a weakly prime, because it can be changed into another prime (39640121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19820061 + 19820062.

It is an arithmetic number, because the mean of its divisors is an integer number (19820062).

Almost surely, 2^39640123 is an apocalyptic number.

39640123 is a deficient number, since it is larger than the sum of its proper divisors (1).

39640123 is an equidigital number, since it uses as much as digits as its factorization.

39640123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 39640123 is about 6296.0402635307. The cubic root of 39640123 is about 340.9664629918.

The spelling of 39640123 in words is "thirty-nine million, six hundred forty thousand, one hundred twenty-three".