39915165420 has 576 divisors, whose sum is σ = 145986946560. Its totient is φ = 9069926400.

The previous prime is 39915165383. The next prime is 39915165431. The reversal of 39915165420 is 2456151993.

39915165420 is a `hidden beast` number, since 3 + 9 + 91 + 5 + 16 + 542 + 0 = 666.

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 191 ways as a sum of consecutive naturals, for example, 49216815 + ... + 49217625.

It is an arithmetic number, because the mean of its divisors is an integer number (253449560).

Almost surely, 2^39915165420 is an apocalyptic number.

39915165420 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 39915165420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72993473280).

39915165420 is an abundant number, since it is smaller than the sum of its proper divisors (106071781140).

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

39915165420 is a wasteful number, since it uses less digits than its factorization.

39915165420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 39915165420 in words is "thirty-nine billion, nine hundred fifteen million, one hundred sixty-five thousand, four hundred twenty".