642937 has 2 divisors, whose sum is σ = 642938. Its totient is φ = 642936.

The previous prime is 642931. The next prime is 642947. The reversal of 642937 is 739246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 89401 = 744^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 642937 - 2⁷ = 642809 is a prime.

It is a d-powerful number, because it can be written as 6 + 4⁴ + 9 + 2¹⁹ + 3⁶ + 7⁶ .

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 642899 and 642908.

It is not a weakly prime, because it can be changed into another prime (642931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321468 + 321469.

It is an arithmetic number, because the mean of its divisors is an integer number (321469).

2⁶⁴²⁹³⁷ is an apocalyptic number.

It is an amenable number.

642937 is a deficient number, since it is larger than the sum of its proper divisors (1).

642937 is an equidigital number, since it uses as much as digits as its factorization.

642937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 642937 is about 801.8335238689. The cubic root of 642937 is about 86.3090109362.

The spelling of 642937 in words is "six hundred forty-two thousand, nine hundred thirty-seven".