13639993 has 2 divisors, whose sum is σ = 13639994. Its totient is φ = 13639992.

The previous prime is 13639973. The next prime is 13640009. The reversal of 13639993 is 39993631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7354944 + 6285049 = 2712^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 13639993 - 2⁵ = 13639961 is a prime.

It is not a weakly prime, because it can be changed into another prime (13639963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819996 + 6819997.

It is an arithmetic number, because the mean of its divisors is an integer number (6819997).

Almost surely, 2^13639993 is an apocalyptic number.

It is an amenable number.

13639993 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639993 is an equidigital number, since it uses as much as digits as its factorization.

13639993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098, while the sum is 43.

The square root of 13639993 is about 3693.2361148456. The cubic root of 13639993 is about 238.9303847712.

The spelling of 13639993 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred ninety-three".