400100055 has 16 divisors (see below), whose sum is σ = 657462624. Its totient is φ = 207619200.

The previous prime is 400100033. The next prime is 400100171. The reversal of 400100055 is 550001004.

It is not a de Polignac number, because 400100055 - 2¹² = 400095959 is a prime.

It is a super-2 number, since 2×400100055² = 320160108022006050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359896 + ... + 361005.

It is an arithmetic number, because the mean of its divisors is an integer number (41091414).

Almost surely, 2^400100055 is an apocalyptic number.

400100055 is a deficient number, since it is larger than the sum of its proper divisors (257362569).

400100055 is a wasteful number, since it uses less digits than its factorization.

400100055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720946.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 400100055 is about 20002.5012185976. The cubic root of 400100055 is about 736.8677289017.

Adding to 400100055 its reverse (550001004), we get a palindrome (950101059).

The spelling of 400100055 in words is "four hundred million, one hundred thousand, fifty-five".