39965381 has 2 divisors, whose sum is σ = 39965382. Its totient is φ = 39965380.

The previous prime is 39965377. The next prime is 39965399. The reversal of 39965381 is 18356993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35164900 + 4800481 = 5930^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 39965381 - 2² = 39965377 is a prime.

It is a super-2 number, since 2×39965381² = 3194463356950322, 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 (39965311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19982690 + 19982691.

It is an arithmetic number, because the mean of its divisors is an integer number (19982691).

Almost surely, 2^39965381 is an apocalyptic number.

It is an amenable number.

39965381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39965381 is an equidigital number, since it uses as much as digits as its factorization.

39965381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 39965381 is about 6321.8178556488. The cubic root of 39965381 is about 341.8964980961.

The spelling of 39965381 in words is "thirty-nine million, nine hundred sixty-five thousand, three hundred eighty-one".