40405201280 has 128 divisors (see below), whose sum is σ = 99142164000. Its totient is φ = 15740780544.

The previous prime is 40405201253. The next prime is 40405201301. The reversal of 40405201280 is 8210250404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4110932 + ... + 4120748.

Almost surely, 2^40405201280 is an apocalyptic number.

40405201280 is a gapful number since it is divisible by the number (40) 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 40405201280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49571082000).

40405201280 is an abundant number, since it is smaller than the sum of its proper divisors (58736962720).

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

40405201280 is a wasteful number, since it uses less digits than its factorization.

40405201280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004 (or 9992 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 40405201280 its reverse (8210250404), we get a palindrome (48615451684).

The spelling of 40405201280 in words is "forty billion, four hundred five million, two hundred one thousand, two hundred eighty".