39949161840 has 480 divisors, whose sum is σ = 165171142656. Its totient is φ = 8451717120.

The previous prime is 39949161829. The next prime is 39949161887. The reversal of 39949161840 is 4816194993.

It is a happy number.

39949161840 is a `hidden beast` number, since 3 + 99 + 491 + 61 + 8 + 4 + 0 = 666.

39949161840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3587962 + ... + 3599078.

Almost surely, 2^39949161840 is an apocalyptic number.

39949161840 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 39949161840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82585571328).

39949161840 is an abundant number, since it is smaller than the sum of its proper divisors (125221980816).

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

39949161840 is a wasteful number, since it uses less digits than its factorization.

39949161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11197 (or 11188 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 39949161840 in words is "thirty-nine billion, nine hundred forty-nine million, one hundred sixty-one thousand, eight hundred forty".