42012091 has 8 divisors (see below), whose sum is σ = 46086768. Its totient is φ = 37980000.

The previous prime is 42012079. The next prime is 42012107. The reversal of 42012091 is 19021024.

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

It is a cyclic number.

It is not a de Polignac number, because 42012091 - 2⁹ = 42011579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42712091) 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, 8560 + ... + 12541.

It is an arithmetic number, because the mean of its divisors is an integer number (5760846).

Almost surely, 2^42012091 is an apocalyptic number.

42012091 is a deficient number, since it is larger than the sum of its proper divisors (4074677).

42012091 is a wasteful number, since it uses less digits than its factorization.

42012091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21293.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 42012091 is about 6481.6734721829. The cubic root of 42012091 is about 347.6360173503.

The spelling of 42012091 in words is "forty-two million, twelve thousand, ninety-one".