401640125 has 16 divisors (see below), whose sum is σ = 502108464. Its totient is φ = 320760000.

The previous prime is 401640121. The next prime is 401640137. The reversal of 401640125 is 521046104.

It can be written as a sum of positive squares in 8 ways, for example, as 15792676 + 385847449 = 3974^2 + 19643^2 .

It is not a de Polignac number, because 401640125 - 2² = 401640121 is a prime.

It is a super-2 number, since 2×401640125² = 322629580020031250, which contains 22 as substring.

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 401640125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401640121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80195 + ... + 85055.

It is an arithmetic number, because the mean of its divisors is an integer number (31381779).

Almost surely, 2^401640125 is an apocalyptic number.

It is an amenable number.

401640125 is a deficient number, since it is larger than the sum of its proper divisors (100468339).

401640125 is an equidigital number, since it uses as much as digits as its factorization.

401640125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5537 (or 5527 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 401640125 is about 20040.9611795443. The cubic root of 401640125 is about 737.8119718150.

Adding to 401640125 its reverse (521046104), we get a palindrome (922686229).

The spelling of 401640125 in words is "four hundred one million, six hundred forty thousand, one hundred twenty-five".