100420643 has 4 divisors (see below), whose sum is σ = 105705960. Its totient is φ = 95135328.

The previous prime is 100420583. The next prime is 100420657. The reversal of 100420643 is 346024001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100420643 - 2⁸ = 100420387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100420843) 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, 2642630 + ... + 2642667.

It is an arithmetic number, because the mean of its divisors is an integer number (26426490).

Almost surely, 2^100420643 is an apocalyptic number.

100420643 is a deficient number, since it is larger than the sum of its proper divisors (5285317).

100420643 is an equidigital number, since it uses as much as digits as its factorization.

100420643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285316.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 100420643 is about 10021.0100788294. The cubic root of 100420643 is about 464.8087902326.

Adding to 100420643 its reverse (346024001), we get a palindrome (446444644).

The spelling of 100420643 in words is "one hundred million, four hundred twenty thousand, six hundred forty-three".