39943481 has 2 divisors, whose sum is σ = 39943482. Its totient is φ = 39943480.

The previous prime is 39943459. The next prime is 39943487. The reversal of 39943481 is 18434993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30426256 + 9517225 = 5516^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 39943481 - 2¹⁰ = 39942457 is a prime.

It is a super-2 number, since 2×39943481² = 3190963348794722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39943487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19971740 + 19971741.

It is an arithmetic number, because the mean of its divisors is an integer number (19971741).

Almost surely, 2^39943481 is an apocalyptic number.

It is an amenable number.

39943481 is a deficient number, since it is larger than the sum of its proper divisors (1).

39943481 is an equidigital number, since it uses as much as digits as its factorization.

39943481 is an evil number, because the sum of its binary digits is even.

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

The square root of 39943481 is about 6320.0855215733. The cubic root of 39943481 is about 341.8340365256.

The spelling of 39943481 in words is "thirty-nine million, nine hundred forty-three thousand, four hundred eighty-one".