39049909 has 4 divisors (see below), whose sum is σ = 39086604. Its totient is φ = 39013216.

The previous prime is 39049889. The next prime is 39049951. The reversal of 39049909 is 90994093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90994093 = 2609 ⋅34877.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 31640625 = 2722^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 39049909 - 2⁵ = 39049877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39049709) 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, 16702 + ... + 18895.

It is an arithmetic number, because the mean of its divisors is an integer number (9771651).

Almost surely, 2^39049909 is an apocalyptic number.

It is an amenable number.

39049909 is a deficient number, since it is larger than the sum of its proper divisors (36695).

39049909 is a wasteful number, since it uses less digits than its factorization.

39049909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36694.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 39049909 is about 6248.9926388179. The cubic root of 39049909 is about 339.2657424424.

The spelling of 39049909 in words is "thirty-nine million, forty-nine thousand, nine hundred nine".