100400555 has 8 divisors (see below), whose sum is σ = 127567872. Its totient is φ = 75595648.

The previous prime is 100400551. The next prime is 100400569. The reversal of 100400555 is 555004001.

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

It is a cyclic number.

It is not a de Polignac number, because 100400555 - 2² = 100400551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100400551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590507 + ... + 590676.

It is an arithmetic number, because the mean of its divisors is an integer number (15945984).

Almost surely, 2^100400555 is an apocalyptic number.

100400555 is a deficient number, since it is larger than the sum of its proper divisors (27167317).

100400555 is a wasteful number, since it uses less digits than its factorization.

100400555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181205.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 100400555 is about 10020.0077345280. The cubic root of 100400555 is about 464.7777949400. Note that the first 4 decimals are identical.

Adding to 100400555 its reverse (555004001), we get a palindrome (655404556).

The spelling of 100400555 in words is "one hundred million, four hundred thousand, five hundred fifty-five".