4001025440 has 24 divisors (see below), whose sum is σ = 9452422980. Its totient is φ = 1600410112.

The previous prime is 4001025419. The next prime is 4001025473. The reversal of 4001025440 is 445201004.

It can be written as a sum of positive squares in 2 ways, for example, as 3632231824 + 368793616 = 60268^2 + 19204^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12503045 + ... + 12503364.

Almost surely, 2^4001025440 is an apocalyptic number.

4001025440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4001025440 is an abundant number, since it is smaller than the sum of its proper divisors (5451397540).

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

4001025440 is a wasteful number, since it uses less digits than its factorization.

4001025440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25006424 (or 25006416 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4001025440 is about 63253.6594988780. The cubic root of 4001025440 is about 1587.5366890894.

Adding to 4001025440 its reverse (445201004), we get a palindrome (4446226444).

The spelling of 4001025440 in words is "four billion, one million, twenty-five thousand, four hundred forty".