642737 has 2 divisors, whose sum is σ = 642738. Its totient is φ = 642736.

The previous prime is 642701. The next prime is 642739. The reversal of 642737 is 737246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456976 + 185761 = 676^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 642737 - 2⁶ = 642673 is a prime.

It is a super-2 number, since 2×642737² = 826221702338, which contains 22 as substring.

Together with 642739, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6 + 4² + 7² + 2¹⁹ + 3⁶ + 7⁶ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642737.

It is not a weakly prime, because it can be changed into another prime (642739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321368 + 321369.

It is an arithmetic number, because the mean of its divisors is an integer number (321369).

2⁶⁴²⁷³⁷ is an apocalyptic number.

It is an amenable number.

642737 is a deficient number, since it is larger than the sum of its proper divisors (1).

642737 is an equidigital number, since it uses as much as digits as its factorization.

642737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 29.

The square root of 642737 is about 801.7088000016. The cubic root of 642737 is about 86.3000605556.

The spelling of 642737 in words is "six hundred forty-two thousand, seven hundred thirty-seven".