39420109 has 4 divisors (see below), whose sum is σ = 39618400. Its totient is φ = 39221820.

The previous prime is 39420089. The next prime is 39420113. The reversal of 39420109 is 90102493.

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: 90102493 = 13 ⋅6930961.

It is a cyclic number.

It is not a de Polignac number, because 39420109 - 2¹⁹ = 38895821 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 (39420119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98847 + ... + 99244.

It is an arithmetic number, because the mean of its divisors is an integer number (9904600).

Almost surely, 2^39420109 is an apocalyptic number.

It is an amenable number.

39420109 is a deficient number, since it is larger than the sum of its proper divisors (198291).

39420109 is a wasteful number, since it uses less digits than its factorization.

39420109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198290.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 39420109 is about 6278.5435413000. The cubic root of 39420109 is about 340.3344718965.

It can be divided in two parts, 394 and 20109, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 39420109 in words is "thirty-nine million, four hundred twenty thousand, one hundred nine".