42493837 has 2 divisors, whose sum is σ = 42493838. Its totient is φ = 42493836.

The previous prime is 42493807. The next prime is 42493849. The reversal of 42493837 is 73839424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33767721 + 8726116 = 5811^2 + 2954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42493837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42493837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42493807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21246918 + 21246919.

It is an arithmetic number, because the mean of its divisors is an integer number (21246919).

Almost surely, 2^42493837 is an apocalyptic number.

It is an amenable number.

42493837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42493837 is an equidigital number, since it uses as much as digits as its factorization.

42493837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 42493837 is about 6518.7297075427. The cubic root of 42493837 is about 348.9597329590.

The spelling of 42493837 in words is "forty-two million, four hundred ninety-three thousand, eight hundred thirty-seven".