39959779 has 2 divisors, whose sum is σ = 39959780. Its totient is φ = 39959778.

The previous prime is 39959693. The next prime is 39959791. The reversal of 39959779 is 97795993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39959779 is a prime.

It is not a weakly prime, because it can be changed into another prime (39953779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19979889 + 19979890.

It is an arithmetic number, because the mean of its divisors is an integer number (19979890).

Almost surely, 2^39959779 is an apocalyptic number.

39959779 is a deficient number, since it is larger than the sum of its proper divisors (1).

39959779 is an equidigital number, since it uses as much as digits as its factorization.

39959779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4822335, while the sum is 58.

The square root of 39959779 is about 6321.3747713611. The cubic root of 39959779 is about 341.8805226558.

The spelling of 39959779 in words is "thirty-nine million, nine hundred fifty-nine thousand, seven hundred seventy-nine".