400028555 has 24 divisors (see below), whose sum is σ = 496983600. Its totient is φ = 309014720.

The previous prime is 400028521. The next prime is 400028593. The reversal of 400028555 is 555820004.

It is not a de Polignac number, because 400028555 - 2⁶ = 400028491 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1486961 + ... + 1487229.

It is an arithmetic number, because the mean of its divisors is an integer number (20707650).

Almost surely, 2^400028555 is an apocalyptic number.

400028555 is a deficient number, since it is larger than the sum of its proper divisors (96955045).

400028555 is an equidigital number, since it uses as much as digits as its factorization.

400028555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 400028555 is about 20000.7138622600. The cubic root of 400028555 is about 736.8238322308.

Adding to 400028555 its reverse (555820004), we get a palindrome (955848559).

The spelling of 400028555 in words is "four hundred million, twenty-eight thousand, five hundred fifty-five".