39964997 has 2 divisors, whose sum is σ = 39964998. Its totient is φ = 39964996.

The previous prime is 39964949. The next prime is 39965027. The reversal of 39964997 is 79946993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21077281 + 18887716 = 4591^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 39964997 - 2¹² = 39960901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39960997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19982498 + 19982499.

It is an arithmetic number, because the mean of its divisors is an integer number (19982499).

Almost surely, 2^39964997 is an apocalyptic number.

It is an amenable number.

39964997 is a deficient number, since it is larger than the sum of its proper divisors (1).

39964997 is an equidigital number, since it uses as much as digits as its factorization.

39964997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 56.

The square root of 39964997 is about 6321.7874845648. The cubic root of 39964997 is about 341.8954030761.

The spelling of 39964997 in words is "thirty-nine million, nine hundred sixty-four thousand, nine hundred ninety-seven".