39640285440 has 720 divisors, whose sum is σ = 163518757248. Its totient is φ = 8981839872.

The previous prime is 39640285439. The next prime is 39640285453. The reversal of 39640285440 is 4458204693.

39640285440 is a `hidden beast` number, since 3 + 96 + 40 + 2 + 85 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 140071539 + ... + 140071821.

Almost surely, 2^39640285440 is an apocalyptic number.

39640285440 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 39640285440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81759378624).

39640285440 is an abundant number, since it is smaller than the sum of its proper divisors (123878471808).

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

39640285440 is a wasteful number, since it uses less digits than its factorization.

39640285440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 39640285440 in words is "thirty-nine billion, six hundred forty million, two hundred eighty-five thousand, four hundred forty".