39104821 has 4 divisors (see below), whose sum is σ = 44691232. Its totient is φ = 33518412.

The previous prime is 39104809. The next prime is 39104827. The reversal of 39104821 is 12840193.

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.

It is a cyclic number.

It is not a de Polignac number, because 39104821 - 2¹⁷ = 38973749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39104821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39104827) 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, 2793195 + ... + 2793208.

It is an arithmetic number, because the mean of its divisors is an integer number (11172808).

Almost surely, 2^39104821 is an apocalyptic number.

It is an amenable number.

39104821 is a deficient number, since it is larger than the sum of its proper divisors (5586411).

39104821 is an equidigital number, since it uses as much as digits as its factorization.

39104821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586410.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 39104821 is about 6253.3847634701. The cubic root of 39104821 is about 339.4246931745.

The spelling of 39104821 in words is "thirty-nine million, one hundred four thousand, eight hundred twenty-one".