39638381 has 2 divisors, whose sum is σ = 39638382. Its totient is φ = 39638380.

The previous prime is 39638369. The next prime is 39638387. The reversal of 39638381 is 18383693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 1136356 = 6205^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 39638381 - 2⁶ = 39638317 is a prime.

It is a super-2 number, since 2×39638381² = 3142402496602322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39638387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19819190 + 19819191.

It is an arithmetic number, because the mean of its divisors is an integer number (19819191).

Almost surely, 2^39638381 is an apocalyptic number.

It is an amenable number.

39638381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39638381 is an equidigital number, since it uses as much as digits as its factorization.

39638381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 39638381 is about 6295.9019210912. The cubic root of 39638381 is about 340.9614682858.

The spelling of 39638381 in words is "thirty-nine million, six hundred thirty-eight thousand, three hundred eighty-one".