39209889 has 4 divisors (see below), whose sum is σ = 52279856. Its totient is φ = 26139924.

The previous prime is 39209879. The next prime is 39209893. The reversal of 39209889 is 98890293.

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: 98890293 = 3 ⋅32963431.

It is not a de Polignac number, because 39209889 - 2⁴ = 39209873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39209879) 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, 6534979 + ... + 6534984.

It is an arithmetic number, because the mean of its divisors is an integer number (13069964).

Almost surely, 2^39209889 is an apocalyptic number.

It is an amenable number.

39209889 is a deficient number, since it is larger than the sum of its proper divisors (13069967).

39209889 is a wasteful number, since it uses less digits than its factorization.

39209889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13069966.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 39209889 is about 6261.7800184931. The cubic root of 39209889 is about 339.7284134533.

The spelling of 39209889 in words is "thirty-nine million, two hundred nine thousand, eight hundred eighty-nine".