40421025 has 30 divisors (see below), whose sum is σ = 74877462. Its totient is φ = 21556800.

The previous prime is 40421023. The next prime is 40421027. The reversal of 40421025 is 52012404.

It is an interprime number because it is at equal distance from previous prime (40421023) and next prime (40421027).

It can be written as a sum of positive squares in 3 ways, for example, as 9585216 + 30835809 = 3096^2 + 5553^2 .

It is not a de Polignac number, because 40421025 - 2¹ = 40421023 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40420989 and 40421007.

It is not an unprimeable number, because it can be changed into a prime (40421021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7956 + ... + 12005.

Almost surely, 2^40421025 is an apocalyptic number.

40421025 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40421025 is a deficient number, since it is larger than the sum of its proper divisors (34456437).

40421025 is a wasteful number, since it uses less digits than its factorization.

40421025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19983 (or 19969 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40421025 is about 6357.7531408509. The cubic root of 40421025 is about 343.1909082388.

Adding to 40421025 its reverse (52012404), we get a palindrome (92433429).

The spelling of 40421025 in words is "forty million, four hundred twenty-one thousand, twenty-five".