400128825 has 12 divisors (see below), whose sum is σ = 661546448. Its totient is φ = 213402000.

The previous prime is 400128793. The next prime is 400128857. The reversal of 400128825 is 528821004.

It is an interprime number because it is at equal distance from previous prime (400128793) and next prime (400128857).

It is not a de Polignac number, because 400128825 - 2⁵ = 400128793 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400128792 and 400128801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2667451 + ... + 2667600.

Almost surely, 2^400128825 is an apocalyptic number.

It is an amenable number.

400128825 is a deficient number, since it is larger than the sum of its proper divisors (261417623).

400128825 is a wasteful number, since it uses less digits than its factorization.

400128825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335064 (or 5335059 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 400128825 is about 20003.2203657311. The cubic root of 400128825 is about 736.8853904643.

Adding to 400128825 its reverse (528821004), we get a palindrome (928949829).

The spelling of 400128825 in words is "four hundred million, one hundred twenty-eight thousand, eight hundred twenty-five".