40021825 has 12 divisors (see below), whose sum is σ = 52546860. Its totient is φ = 30133760.

The previous prime is 40021819. The next prime is 40021841. The reversal of 40021825 is 52812004.

It can be written as a sum of positive squares in 6 ways, for example, as 1034289 + 38987536 = 1017^2 + 6244^2 .

It is not a de Polignac number, because 40021825 - 2⁹ = 40021313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40021796 and 40021805.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46660 + ... + 47509.

It is an arithmetic number, because the mean of its divisors is an integer number (4378905).

Almost surely, 2^40021825 is an apocalyptic number.

It is an amenable number.

40021825 is a deficient number, since it is larger than the sum of its proper divisors (12525035).

40021825 is a wasteful number, since it uses less digits than its factorization.

40021825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94196 (or 94191 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 40021825 is about 6326.2805027915. The cubic root of 40021825 is about 342.0573784011.

Adding to 40021825 its reverse (52812004), we get a palindrome (92833829).

The spelling of 40021825 in words is "forty million, twenty-one thousand, eight hundred twenty-five".