3992405595621 has 4 divisors (see below), whose sum is σ = 5323207460832. Its totient is φ = 2661603730412.

The previous prime is 3992405595613. The next prime is 3992405595631. The reversal of 3992405595621 is 1265955042993.

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 3992405595621 - 2³ = 3992405595613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992405595631) 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, 665400932601 + ... + 665400932606.

It is an arithmetic number, because the mean of its divisors is an integer number (1330801865208).

Almost surely, 2^{3992405595621} is an apocalyptic number.

It is an amenable number.

3992405595621 is a deficient number, since it is larger than the sum of its proper divisors (1330801865211).

3992405595621 is a wasteful number, since it uses less digits than its factorization.

3992405595621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330801865210.

The product of its (nonzero) digits is 26244000, while the sum is 60.

The spelling of 3992405595621 in words is "three trillion, nine hundred ninety-two billion, four hundred five million, five hundred ninety-five thousand, six hundred twenty-one".