400520055 has 32 divisors (see below), whose sum is σ = 695439360. Its totient is φ = 195661440.

The previous prime is 400520011. The next prime is 400520059. The reversal of 400520055 is 550025004.

It is not a de Polignac number, because 400520055 - 2⁶ = 400519991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400520059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17706 + ... + 33384.

It is an arithmetic number, because the mean of its divisors is an integer number (21732480).

Almost surely, 2^400520055 is an apocalyptic number.

400520055 is a deficient number, since it is larger than the sum of its proper divisors (294919305).

400520055 is a wasteful number, since it uses less digits than its factorization.

400520055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15831.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 400520055 is about 20012.9971518511. The cubic root of 400520055 is about 737.1254779430.

Adding to 400520055 its reverse (550025004), we get a palindrome (950545059).

The spelling of 400520055 in words is "four hundred million, five hundred twenty thousand, fifty-five".