39920405004 has 36 divisors (see below), whose sum is σ = 100939841184. Its totient is φ = 13302855072.

The previous prime is 39920405003. The next prime is 39920405027. The reversal of 39920405004 is 40050402993.

39920405004 is a `hidden beast` number, since 3 + 99 + 20 + 40 + 500 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 39920405004.

It is not an unprimeable number, because it can be changed into a prime (39920405003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40087 + ... + 285390.

Almost surely, 2^39920405004 is an apocalyptic number.

It is an amenable number.

39920405004 is an abundant number, since it is smaller than the sum of its proper divisors (61019436180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39920405004 is a wasteful number, since it uses less digits than its factorization.

39920405004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328894 (or 328889 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 39920405004 its reverse (40050402993), we get a palindrome (79970807997).

The spelling of 39920405004 in words is "thirty-nine billion, nine hundred twenty million, four hundred five thousand, four".