42493091 has 4 divisors (see below), whose sum is σ = 43958400. Its totient is φ = 41027784.

The previous prime is 42493051. The next prime is 42493093. The reversal of 42493091 is 19039424.

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 42493091 - 2¹⁰ = 42492067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42493093) 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, 732611 + ... + 732668.

It is an arithmetic number, because the mean of its divisors is an integer number (10989600).

Almost surely, 2^42493091 is an apocalyptic number.

42493091 is a deficient number, since it is larger than the sum of its proper divisors (1465309).

42493091 is a wasteful number, since it uses less digits than its factorization.

42493091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465308.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 42493091 is about 6518.6724875545. The cubic root of 42493091 is about 348.9576908944.

The spelling of 42493091 in words is "forty-two million, four hundred ninety-three thousand, ninety-one".