42540397 has 4 divisors (see below), whose sum is σ = 43343100. Its totient is φ = 41737696.

The previous prime is 42540391. The next prime is 42540403. The reversal of 42540397 is 79304524.

42540397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42540391) and next prime (42540403).

It can be written as a sum of positive squares in 2 ways, for example, as 10118761 + 32421636 = 3181^2 + 5694^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540397 - 2³ = 42540389 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 (42540391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401272 + ... + 401377.

It is an arithmetic number, because the mean of its divisors is an integer number (10835775).

Almost surely, 2^42540397 is an apocalyptic number.

It is an amenable number.

42540397 is a deficient number, since it is larger than the sum of its proper divisors (802703).

42540397 is an equidigital number, since it uses as much as digits as its factorization.

42540397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802702.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 42540397 is about 6522.2999777686. The cubic root of 42540397 is about 349.0871368042.

The spelling of 42540397 in words is "forty-two million, five hundred forty thousand, three hundred ninety-seven".