39550009 has 2 divisors, whose sum is σ = 39550010. Its totient is φ = 39550008.

The previous prime is 39549989. The next prime is 39550057. The reversal of 39550009 is 90005593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31866025 + 7683984 = 5645^2 + 2772^2 .

It is a cyclic number.

It is not a de Polignac number, because 39550009 - 2⁵ = 39549977 is a prime.

It is not a weakly prime, because it can be changed into another prime (39550909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19775004 + 19775005.

It is an arithmetic number, because the mean of its divisors is an integer number (19775005).

Almost surely, 2^39550009 is an apocalyptic number.

It is an amenable number.

39550009 is a deficient number, since it is larger than the sum of its proper divisors (1).

39550009 is an equidigital number, since it uses as much as digits as its factorization.

39550009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 39550009 is about 6288.8797889608. The cubic root of 39550009 is about 340.7078936263.

The spelling of 39550009 in words is "thirty-nine million, five hundred fifty thousand, nine".