400128925 has 24 divisors (see below), whose sum is σ = 568491392. Its totient is φ = 273672000.

The previous prime is 400128899. The next prime is 400128929. The reversal of 400128925 is 529821004.

It is not a de Polignac number, because 400128925 - 2²⁷ = 265911197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400128929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70960 + ... + 76390.

Almost surely, 2^400128925 is an apocalyptic number.

It is an amenable number.

400128925 is a deficient number, since it is larger than the sum of its proper divisors (168362467).

400128925 is a wasteful number, since it uses less digits than its factorization.

400128925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869 (or 5864 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 400128925 is about 20003.2228653285. Note that the first 3 decimals coincide. The cubic root of 400128925 is about 736.8854518516.

Adding to 400128925 its reverse (529821004), we get a palindrome (929949929).

The spelling of 400128925 in words is "four hundred million, one hundred twenty-eight thousand, nine hundred twenty-five".