39920855040 has 576 divisors, whose sum is σ = 153991393920. Its totient is φ = 9482403840.

The previous prime is 39920855017. The next prime is 39920855063. The reversal of 39920855040 is 4055802993.

39920855040 is a `hidden beast` number, since 3 + 9 + 92 + 0 + 8 + 550 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (39920855017) and next prime (39920855063).

It is a tau number, because it is divible by the number of its divisors (576).

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 47 ways as a sum of consecutive naturals, for example, 53728909 + ... + 53729651.

It is an arithmetic number, because the mean of its divisors is an integer number (267346170).

Almost surely, 2^39920855040 is an apocalyptic number.

39920855040 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 39920855040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76995696960).

39920855040 is an abundant number, since it is smaller than the sum of its proper divisors (114070538880).

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

39920855040 is a wasteful number, since it uses less digits than its factorization.

39920855040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 39920855040 in words is "thirty-nine billion, nine hundred twenty million, eight hundred fifty-five thousand, forty".