39999449 has 4 divisors (see below), whose sum is σ = 45713664. Its totient is φ = 34285236.

The previous prime is 39999437. The next prime is 39999451. The reversal of 39999449 is 94499993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94499993 = 7 ⋅13499999.

It is a cyclic number.

It is not a de Polignac number, because 39999449 - 2⁴ = 39999433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39999394 and 39999403.

It is not an unprimeable number, because it can be changed into a prime (39999499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857097 + ... + 2857110.

It is an arithmetic number, because the mean of its divisors is an integer number (11428416).

Almost surely, 2^39999449 is an apocalyptic number.

It is an amenable number.

39999449 is a deficient number, since it is larger than the sum of its proper divisors (5714215).

39999449 is an equidigital number, since it uses as much as digits as its factorization.

39999449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714214.

The product of its digits is 2834352, while the sum is 56.

The square root of 39999449 is about 6324.5117598120. The cubic root of 39999449 is about 341.9936190002.

The spelling of 39999449 in words is "thirty-nine million, nine hundred ninety-nine thousand, four hundred forty-nine".