40004240425 has 6 divisors (see below), whose sum is σ = 49605258158. Its totient is φ = 32003392320.

The previous prime is 40004240371. The next prime is 40004240461. The reversal of 40004240425 is 52404240004.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4288154256 + 35716086169 = 65484^2 + 188987^2 .

It is not a de Polignac number, because 40004240425 - 2¹⁵ = 40004207657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1600169617 = 40004240425 / (4 + 0 + 0 + 0 + 4 + 2 + 4 + 0 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40004240425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800084784 + ... + 800084833.

Almost surely, 2^40004240425 is an apocalyptic number.

It is an amenable number.

40004240425 is a deficient number, since it is larger than the sum of its proper divisors (9601017733).

40004240425 is a wasteful number, since it uses less digits than its factorization.

40004240425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600169627 (or 1600169622 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

Adding to 40004240425 its reverse (52404240004), we get a palindrome (92408480429).

The spelling of 40004240425 in words is "forty billion, four million, two hundred forty thousand, four hundred twenty-five".