400512025 has 6 divisors (see below), whose sum is σ = 496634942. Its totient is φ = 320409600.

The previous prime is 400511981. The next prime is 400512029. The reversal of 400512025 is 520215004.

It can be written as a sum of positive squares in 3 ways, for example, as 108409744 + 292102281 = 10412^2 + 17091^2 .

It is not a de Polignac number, because 400512025 - 2²⁷ = 266294297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400511993 and 400512011.

It is not an unprimeable number, because it can be changed into a prime (400512029) 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 5 ways as a sum of consecutive naturals, for example, 8010216 + ... + 8010265.

Almost surely, 2^400512025 is an apocalyptic number.

It is an amenable number.

400512025 is a deficient number, since it is larger than the sum of its proper divisors (96122917).

400512025 is a wasteful number, since it uses less digits than its factorization.

400512025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16020491 (or 16020486 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 400512025 is about 20012.7965312197. The cubic root of 400512025 is about 737.1205517168.

Adding to 400512025 its reverse (520215004), we get a palindrome (920727029).

The spelling of 400512025 in words is "four hundred million, five hundred twelve thousand, twenty-five".