402442040125 has 8 divisors (see below), whose sum is σ = 502247666232. Its totient is φ = 321953632000.

The previous prime is 402442040101. The next prime is 402442040129. The reversal of 402442040125 is 521040244204.

It can be written as a sum of positive squares in 4 ways, for example, as 5757470884 + 396684569241 = 75878^2 + 629829^2 .

It is not a de Polignac number, because 402442040125 - 2⁹ = 402442039613 is a prime.

It is a super-2 number, since 2×402442040125² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402442040093 and 402442040102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402442040129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1609768036 + ... + 1609768285.

It is an arithmetic number, because the mean of its divisors is an integer number (62780958279).

Almost surely, 2^402442040125 is an apocalyptic number.

It is an amenable number.

402442040125 is a deficient number, since it is larger than the sum of its proper divisors (99805626107).

402442040125 is an equidigital number, since it uses as much as digits as its factorization.

402442040125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219536336 (or 3219536326 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 402442040125 its reverse (521040244204), we get a palindrome (923482284329).

The spelling of 402442040125 in words is "four hundred two billion, four hundred forty-two million, forty thousand, one hundred twenty-five".