39686137920 has 1344 divisors, whose sum is σ = 172225557504. Its totient is φ = 8569774080.

The previous prime is 39686137901. The next prime is 39686137961. The reversal of 39686137920 is 2973168693.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 478146199 + ... + 478146281.

It is an arithmetic number, because the mean of its divisors is an integer number (128144016).

Almost surely, 2^39686137920 is an apocalyptic number.

39686137920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39686137920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86112778752).

39686137920 is an abundant number, since it is smaller than the sum of its proper divisors (132539419584).

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

39686137920 is a wasteful number, since it uses less digits than its factorization.

39686137920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 39686137920 in words is "thirty-nine billion, six hundred eighty-six million, one hundred thirty-seven thousand, nine hundred twenty".