40002000025 has 81 divisors (see below), whose sum is σ = 57373891173. Its totient is φ = 27648691200.

The previous prime is 40001999987. The next prime is 40002000029. The reversal of 40002000025 is 52000020004.

It is a happy number.

The square root of 40002000025 is 200005.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 40 ways, for example, as 14785830409 + 25216169616 = 121597^2 + 158796^2 .

It is not a de Polignac number, because 40002000025 - 2¹⁹ = 40001475737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40001999969 and 40002000014.

It is not an unprimeable number, because it can be changed into a prime (40002000029) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 221005435 + ... + 221005615.

Almost surely, 2^40002000025 is an apocalyptic number.

40002000025 is the 200005-th square number.

40002000025 is the 100003-rd centered octagonal number.

It is an amenable number.

40002000025 is a deficient number, since it is larger than the sum of its proper divisors (17371891148).

40002000025 is a wasteful number, since it uses less digits than its factorization.

40002000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

Adding to 40002000025 its reverse (52000020004), we get a palindrome (92002020029).

The spelling of 40002000025 in words is "forty billion, two million, twenty-five", and thus it is an aban number and an uban number.