100400208 has 20 divisors (see below), whose sum is σ = 259367328. Its totient is φ = 33466720.

The previous prime is 100400207. The next prime is 100400257. The reversal of 100400208 is 802004001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100400207) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1045788 + ... + 1045883.

Almost surely, 2^100400208 is an apocalyptic number.

It is an amenable number.

100400208 is an abundant number, since it is smaller than the sum of its proper divisors (158967120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100400208 is a wasteful number, since it uses less digits than its factorization.

100400208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091682 (or 2091676 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 100400208 is about 10019.9904191571. The cubic root of 100400208 is about 464.7772594912. Note that the first 3 decimals are identical.

Adding to 100400208 its reverse (802004001), we get a palindrome (902404209).

The spelling of 100400208 in words is "one hundred million, four hundred thousand, two hundred eight".