39517993 has 2 divisors, whose sum is σ = 39517994. Its totient is φ = 39517992.

The previous prime is 39517987. The next prime is 39518027. The reversal of 39517993 is 39971593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27071209 + 12446784 = 5203^2 + 3528^2 .

It is a cyclic number.

It is not a de Polignac number, because 39517993 - 2¹³ = 39509801 is a prime.

It is not a weakly prime, because it can be changed into another prime (39517943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19758996 + 19758997.

It is an arithmetic number, because the mean of its divisors is an integer number (19758997).

Almost surely, 2^39517993 is an apocalyptic number.

It is an amenable number.

39517993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39517993 is an equidigital number, since it uses as much as digits as its factorization.

39517993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 46.

The square root of 39517993 is about 6286.3338282341. Note that the first 3 decimals coincide. The cubic root of 39517993 is about 340.6159336924.

The spelling of 39517993 in words is "thirty-nine million, five hundred seventeen thousand, nine hundred ninety-three".