100400243 has 4 divisors (see below), whose sum is σ = 100420320. Its totient is φ = 100380168.

The previous prime is 100400207. The next prime is 100400257. The reversal of 100400243 is 342004001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342004001 = 41 ⋅8341561.

It is a cyclic number.

It is not a de Polignac number, because 100400243 - 2¹⁰ = 100399219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100400273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4118 + ... + 14756.

It is an arithmetic number, because the mean of its divisors is an integer number (25105080).

Almost surely, 2^100400243 is an apocalyptic number.

100400243 is a deficient number, since it is larger than the sum of its proper divisors (20077).

100400243 is an equidigital number, since it uses as much as digits as its factorization.

100400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20076.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 100400243 is about 10019.9921656656. The cubic root of 100400243 is about 464.7773134991. Note that the first 3 decimals are identical.

Adding to 100400243 its reverse (342004001), we get a palindrome (442404244).

The spelling of 100400243 in words is "one hundred million, four hundred thousand, two hundred forty-three".