400135025 has 24 divisors (see below), whose sum is σ = 519073920. Its totient is φ = 305402240.

The previous prime is 400135009. The next prime is 400135039. The reversal of 400135025 is 520531004.

It is not a de Polignac number, because 400135025 - 2⁴ = 400135009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400134988 and 400135006.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 326564 + ... + 327786.

It is an arithmetic number, because the mean of its divisors is an integer number (21628080).

Almost surely, 2^400135025 is an apocalyptic number.

It is an amenable number.

400135025 is a deficient number, since it is larger than the sum of its proper divisors (118938895).

400135025 is a wasteful number, since it uses less digits than its factorization.

400135025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 400135025 is about 20003.3753401770. The cubic root of 400135025 is about 736.8891964600.

Adding to 400135025 its reverse (520531004), we get a palindrome (920666029).

The spelling of 400135025 in words is "four hundred million, one hundred thirty-five thousand, twenty-five".