39919999 has 4 divisors (see below), whose sum is σ = 45622864. Its totient is φ = 34217136.

The previous prime is 39919991. The next prime is 39920017. The reversal of 39919999 is 99991993.

It is a happy number.

39919999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39919999 - 2³ = 39919991 is a prime.

39919999 is a modest number, since divided by 9999 gives 3991 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39919991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2851422 + ... + 2851435.

It is an arithmetic number, because the mean of its divisors is an integer number (11405716).

Almost surely, 2^39919999 is an apocalyptic number.

39919999 is a deficient number, since it is larger than the sum of its proper divisors (5702865).

39919999 is an equidigital number, since it uses as much as digits as its factorization.

39919999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5702864.

The product of its digits is 1594323, while the sum is 58.

The square root of 39919999 is about 6318.2275204364. The cubic root of 39919999 is about 341.7670375217.

The spelling of 39919999 in words is "thirty-nine million, nine hundred nineteen thousand, nine hundred ninety-nine".