42100391 has 8 divisors (see below), whose sum is σ = 43809984. Its totient is φ = 40424800.

The previous prime is 42100379. The next prime is 42100403. The reversal of 42100391 is 19300124.

It is an interprime number because it is at equal distance from previous prime (42100379) and next prime (42100403).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42100391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42100301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5960 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (5476248).

Almost surely, 2^42100391 is an apocalyptic number.

42100391 is a deficient number, since it is larger than the sum of its proper divisors (1709593).

42100391 is a wasteful number, since it uses less digits than its factorization.

42100391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 42100391 is about 6488.4814093900. The cubic root of 42100391 is about 347.8793979195.

The spelling of 42100391 in words is "forty-two million, one hundred thousand, three hundred ninety-one".