39949999 has 2 divisors, whose sum is σ = 39950000. Its totient is φ = 39949998.

The previous prime is 39949993. The next prime is 39950003. The reversal of 39949999 is 99994993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39949999 - 2²¹ = 37852847 is a prime.

39949999 is a modest number, since divided by 9999 gives 3994 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39949993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19974999 + 19975000.

It is an arithmetic number, because the mean of its divisors is an integer number (19975000).

Almost surely, 2^39949999 is an apocalyptic number.

39949999 is a deficient number, since it is larger than the sum of its proper divisors (1).

39949999 is an equidigital number, since it uses as much as digits as its factorization.

39949999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6377292, while the sum is 61.

The square root of 39949999 is about 6320.6011581178. The cubic root of 39949999 is about 341.8526290720.

The spelling of 39949999 in words is "thirty-nine million, nine hundred forty-nine thousand, nine hundred ninety-nine".