40401425 has 6 divisors (see below), whose sum is σ = 50097798. Its totient is φ = 32321120.

The previous prime is 40401421. The next prime is 40401433. The reversal of 40401425 is 52410404.

It can be written as a sum of positive squares in 3 ways, for example, as 9443329 + 30958096 = 3073^2 + 5564^2 .

It is not a de Polignac number, because 40401425 - 2² = 40401421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40401397 and 40401406.

It is not an unprimeable number, because it can be changed into a prime (40401421) 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 5 ways as a sum of consecutive naturals, for example, 808004 + ... + 808053.

It is an arithmetic number, because the mean of its divisors is an integer number (8349633).

Almost surely, 2^40401425 is an apocalyptic number.

It is an amenable number.

40401425 is a deficient number, since it is larger than the sum of its proper divisors (9696373).

40401425 is a wasteful number, since it uses less digits than its factorization.

40401425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616067 (or 1616062 counting only the distinct ones).

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

The square root of 40401425 is about 6356.2115288905. The cubic root of 40401425 is about 343.1354286188.

Adding to 40401425 its reverse (52410404), we get a palindrome (92811829).

The spelling of 40401425 in words is "forty million, four hundred one thousand, four hundred twenty-five".