39897841 has 2 divisors, whose sum is σ = 39897842. Its totient is φ = 39897840.

The previous prime is 39897829. The next prime is 39897857. The reversal of 39897841 is 14879893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24216241 + 15681600 = 4921^2 + 3960^2 .

It is a cyclic number.

It is not a de Polignac number, because 39897841 - 2⁹ = 39897329 is a prime.

It is a super-2 number, since 2×39897841² = 3183675432922562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39897821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19948920 + 19948921.

It is an arithmetic number, because the mean of its divisors is an integer number (19948921).

Almost surely, 2^39897841 is an apocalyptic number.

It is an amenable number.

39897841 is a deficient number, since it is larger than the sum of its proper divisors (1).

39897841 is an equidigital number, since it uses as much as digits as its factorization.

39897841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 39897841 is about 6316.4737789371. The cubic root of 39897841 is about 341.7037920660.

The spelling of 39897841 in words is "thirty-nine million, eight hundred ninety-seven thousand, eight hundred forty-one".