42145393 has 4 divisors (see below), whose sum is σ = 42159348. Its totient is φ = 42131440.

The previous prime is 42145379. The next prime is 42145403. The reversal of 42145393 is 39354124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21049744 + 21095649 = 4588^2 + 4593^2 .

It is a cyclic number.

It is not a de Polignac number, because 42145393 - 2¹³ = 42137201 is a prime.

It is a super-2 number, since 2×42145393² = 3552468302248898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42145333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346 + ... + 9187.

It is an arithmetic number, because the mean of its divisors is an integer number (10539837).

It is a vampire number, since it can be written as 4421 ⋅ 9533 (with its own digits).

Almost surely, 2^42145393 is an apocalyptic number.

It is an amenable number.

42145393 is a deficient number, since it is larger than the sum of its proper divisors (13955).

42145393 is an equidigital number, since it uses as much as digits as its factorization.

42145393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13954.

The product of its digits is 12960, while the sum is 31.

The square root of 42145393 is about 6491.9483208048. The cubic root of 42145393 is about 348.0033056673.

The spelling of 42145393 in words is "forty-two million, one hundred forty-five thousand, three hundred ninety-three".