39639361 has 2 divisors, whose sum is σ = 39639362. Its totient is φ = 39639360.

The previous prime is 39639349. The next prime is 39639401. The reversal of 39639361 is 16393693.

It is a happy number.

It is an a-pointer prime, because the next prime (39639401) can be obtained adding 39639361 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37748736 + 1890625 = 6144^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 39639361 - 2⁷ = 39639233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39639311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19819680 + 19819681.

It is an arithmetic number, because the mean of its divisors is an integer number (19819681).

Almost surely, 2^39639361 is an apocalyptic number.

It is an amenable number.

39639361 is a deficient number, since it is larger than the sum of its proper divisors (1).

39639361 is an equidigital number, since it uses as much as digits as its factorization.

39639361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 40.

The square root of 39639361 is about 6295.9797490144. The cubic root of 39639361 is about 340.9642781843.

It can be divided in two parts, 39639 and 361, that added together give a square (40000 = 200²).

The spelling of 39639361 in words is "thirty-nine million, six hundred thirty-nine thousand, three hundred sixty-one".