39185971990 has 32 divisors (see below), whose sum is σ = 77694080256. Its totient is φ = 14111096160.

The previous prime is 39185971961. The next prime is 39185971991. The reversal of 39185971990 is 9917958193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39185971991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1717972 + ... + 1740631.

It is an arithmetic number, because the mean of its divisors is an integer number (2427940008).

Almost surely, 2^39185971990 is an apocalyptic number.

39185971990 is a deficient number, since it is larger than the sum of its proper divisors (38508108266).

39185971990 is a wasteful number, since it uses less digits than its factorization.

39185971990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458724.

The product of its (nonzero) digits is 5511240, while the sum is 61.

The spelling of 39185971990 in words is "thirty-nine billion, one hundred eighty-five million, nine hundred seventy-one thousand, nine hundred ninety".