39985951 has 2 divisors, whose sum is σ = 39985952. Its totient is φ = 39985950.

The previous prime is 39985871. The next prime is 39985987. The reversal of 39985951 is 15958993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39985951 - 2¹¹ = 39983903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39985895 and 39985904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39986951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19992975 + 19992976.

It is an arithmetic number, because the mean of its divisors is an integer number (19992976).

Almost surely, 2^39985951 is an apocalyptic number.

39985951 is a deficient number, since it is larger than the sum of its proper divisors (1).

39985951 is an equidigital number, since it uses as much as digits as its factorization.

39985951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 49.

The square root of 39985951 is about 6323.4445518246. Note that the first 3 decimals coincide. The cubic root of 39985951 is about 341.9551455601.

The spelling of 39985951 in words is "thirty-nine million, nine hundred eighty-five thousand, nine hundred fifty-one".