42947837 has 2 divisors, whose sum is σ = 42947838. Its totient is φ = 42947836.

The previous prime is 42947833. The next prime is 42947897. The reversal of 42947837 is 73874924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34916281 + 8031556 = 5909^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 42947837 - 2² = 42947833 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42947833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21473918 + 21473919.

It is an arithmetic number, because the mean of its divisors is an integer number (21473919).

Almost surely, 2^42947837 is an apocalyptic number.

It is an amenable number.

42947837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42947837 is an equidigital number, since it uses as much as digits as its factorization.

42947837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 44.

The square root of 42947837 is about 6553.4599258712. The cubic root of 42947837 is about 350.1980837910.

The spelling of 42947837 in words is "forty-two million, nine hundred forty-seven thousand, eight hundred thirty-seven".