100400225 has 12 divisors (see below), whose sum is σ = 127146624. Its totient is φ = 78610320.

The previous prime is 100400207. The next prime is 100400257. The reversal of 100400225 is 522004001.

It is a de Polignac number, because none of the positive numbers 2^k-100400225 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41549 + ... + 43898.

It is an arithmetic number, because the mean of its divisors is an integer number (10595552).

Almost surely, 2^100400225 is an apocalyptic number.

It is an amenable number.

100400225 is a deficient number, since it is larger than the sum of its proper divisors (26746399).

100400225 is an equidigital number, since it uses as much as digits as its factorization.

100400225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85504 (or 85499 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 100400225 is about 10019.9912674613. The cubic root of 100400225 is about 464.7772857236. Note that the first 3 decimals are identical.

Adding to 100400225 its reverse (522004001), we get a palindrome (622404226).

The spelling of 100400225 in words is "one hundred million, four hundred thousand, two hundred twenty-five".