39942401 has 6 divisors (see below), whose sum is σ = 42430470. Its totient is φ = 37592576.

The previous prime is 39942379. The next prime is 39942439. The reversal of 39942401 is 10424993.

It is a happy number.

It is a Cunningham number, because it is equal to 6320²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 12390400 + 27552001 = 3520^2 + 5249^2 .

It is not a de Polignac number, because 39942401 - 2¹⁴ = 39926017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39942451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68816 + ... + 69393.

It is an arithmetic number, because the mean of its divisors is an integer number (7071745).

Almost surely, 2^39942401 is an apocalyptic number.

It is an amenable number.

39942401 is a deficient number, since it is larger than the sum of its proper divisors (2488069).

39942401 is a wasteful number, since it uses less digits than its factorization.

39942401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138243 (or 138226 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 39942401 is about 6320.0000791139. Note that the first 4 decimals coincide. The cubic root of 39942401 is about 341.8309556384.

The spelling of 39942401 in words is "thirty-nine million, nine hundred forty-two thousand, four hundred one".