40439977 has 2 divisors, whose sum is σ = 40439978. Its totient is φ = 40439976.

The previous prime is 40439969. The next prime is 40440013. The reversal of 40439977 is 77993404.

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., 36192256 + 4247721 = 6016^2 + 2061^2 .

It is a cyclic number.

It is not a de Polignac number, because 40439977 - 2³ = 40439969 is a prime.

It is not a weakly prime, because it can be changed into another prime (40439947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219988 + 20219989.

It is an arithmetic number, because the mean of its divisors is an integer number (20219989).

Almost surely, 2^40439977 is an apocalyptic number.

It is an amenable number.

40439977 is a deficient number, since it is larger than the sum of its proper divisors (1).

40439977 is an equidigital number, since it uses as much as digits as its factorization.

40439977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 40439977 is about 6359.2434298429. The cubic root of 40439977 is about 343.2445365822.

The spelling of 40439977 in words is "forty million, four hundred thirty-nine thousand, nine hundred seventy-seven".