42821237 has 4 divisors (see below), whose sum is σ = 43200300. Its totient is φ = 42442176.

The previous prime is 42821227. The next prime is 42821287. The reversal of 42821237 is 73212824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5354596 + 37466641 = 2314^2 + 6121^2 .

It is a cyclic number.

It is not a de Polignac number, because 42821237 - 2⁴ = 42821221 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 (42821227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189362 + ... + 189587.

It is an arithmetic number, because the mean of its divisors is an integer number (10800075).

Almost surely, 2^42821237 is an apocalyptic number.

It is an amenable number.

42821237 is a deficient number, since it is larger than the sum of its proper divisors (379063).

42821237 is a wasteful number, since it uses less digits than its factorization.

42821237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379062.

The product of its digits is 5376, while the sum is 29.

The square root of 42821237 is about 6543.7937773130. The cubic root of 42821237 is about 349.8536449315.

The spelling of 42821237 in words is "forty-two million, eight hundred twenty-one thousand, two hundred thirty-seven".