42979837 has 2 divisors, whose sum is σ = 42979838. Its totient is φ = 42979836.

The previous prime is 42979831. The next prime is 42979861. The reversal of 42979837 is 73897924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38266596 + 4713241 = 6186^2 + 2171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42979837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42979831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21489918 + 21489919.

It is an arithmetic number, because the mean of its divisors is an integer number (21489919).

Almost surely, 2^42979837 is an apocalyptic number.

It is an amenable number.

42979837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42979837 is an equidigital number, since it uses as much as digits as its factorization.

42979837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 42979837 is about 6555.9009296968. The cubic root of 42979837 is about 350.2850385511.

The spelling of 42979837 in words is "forty-two million, nine hundred seventy-nine thousand, eight hundred thirty-seven".