400128926 has 8 divisors (see below), whose sum is σ = 602684544. Its totient is φ = 199234080.

The previous prime is 400128899. The next prime is 400128929. The reversal of 400128926 is 629821004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400128892 and 400128901.

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 3 ways as a sum of consecutive naturals, for example, 414590 + ... + 415553.

It is an arithmetic number, because the mean of its divisors is an integer number (75335568).

Almost surely, 2^400128926 is an apocalyptic number.

400128926 is a deficient number, since it is larger than the sum of its proper divisors (202555618).

400128926 is a wasteful number, since it uses less digits than its factorization.

400128926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830386.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 400128926 is about 20003.2228903244. Note that the first 3 decimals coincide. The cubic root of 400128926 is about 736.8854524655.

The spelling of 400128926 in words is "four hundred million, one hundred twenty-eight thousand, nine hundred twenty-six".