42100643 has 4 divisors (see below), whose sum is σ = 45339168. Its totient is φ = 38862120.

The previous prime is 42100631. The next prime is 42100661. The reversal of 42100643 is 34600124.

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 42100643 - 2¹² = 42096547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42100613) 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, 1619243 + ... + 1619268.

It is an arithmetic number, because the mean of its divisors is an integer number (11334792).

Almost surely, 2^42100643 is an apocalyptic number.

42100643 is a deficient number, since it is larger than the sum of its proper divisors (3238525).

42100643 is a wasteful number, since it uses less digits than its factorization.

42100643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238524.

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

The square root of 42100643 is about 6488.5008283886. The cubic root of 42100643 is about 347.8800920178.

Adding to 42100643 its reverse (34600124), we get a palindrome (76700767).

The spelling of 42100643 in words is "forty-two million, one hundred thousand, six hundred forty-three".