400440125 has 16 divisors (see below), whose sum is σ = 501649200. Its totient is φ = 319134400.

The previous prime is 400440119. The next prime is 400440191. The reversal of 400440125 is 521044004.

It can be written as a sum of positive squares in 8 ways, for example, as 265624804 + 134815321 = 16298^2 + 11611^2 .

It is not a de Polignac number, because 400440125 - 2⁴ = 400440109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400440097 and 400440106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27671 + ... + 39579.

It is an arithmetic number, because the mean of its divisors is an integer number (31353075).

Almost surely, 2^400440125 is an apocalyptic number.

It is an amenable number.

400440125 is a deficient number, since it is larger than the sum of its proper divisors (101209075).

400440125 is a wasteful number, since it uses less digits than its factorization.

400440125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12193 (or 12183 counting only the distinct ones).

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

The square root of 400440125 is about 20011.0000999450. Note that the first 4 decimals coincide. The cubic root of 400440125 is about 737.0764397334.

Adding to 400440125 its reverse (521044004), we get a palindrome (921484129).

The spelling of 400440125 in words is "four hundred million, four hundred forty thousand, one hundred twenty-five".