39401881 has 2 divisors, whose sum is σ = 39401882. Its totient is φ = 39401880.

The previous prime is 39401867. The next prime is 39401893. The reversal of 39401881 is 18810493.

It is a happy number.

39401881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 1690000 = 6141^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 39401881 - 2⁵ = 39401849 is a prime.

It is a super-2 number, since 2×39401881² = 3105016452676322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39401821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19700940 + 19700941.

It is an arithmetic number, because the mean of its divisors is an integer number (19700941).

Almost surely, 2^39401881 is an apocalyptic number.

It is an amenable number.

39401881 is a deficient number, since it is larger than the sum of its proper divisors (1).

39401881 is an equidigital number, since it uses as much as digits as its factorization.

39401881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 39401881 is about 6277.0917629106. The cubic root of 39401881 is about 340.2820065148.

The spelling of 39401881 in words is "thirty-nine million, four hundred one thousand, eight hundred eighty-one".