642439337 has 2 divisors, whose sum is σ = 642439338. Its totient is φ = 642439336.

The previous prime is 642439331. The next prime is 642439361. The reversal of 642439337 is 733934246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501043456 + 141395881 = 22384^2 + 11891^2 .

It is a cyclic number.

It is not a de Polignac number, because 642439337 - 2⁴ = 642439321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 642439294 and 642439303.

It is not a weakly prime, because it can be changed into another prime (642439331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321219668 + 321219669.

It is an arithmetic number, because the mean of its divisors is an integer number (321219669).

Almost surely, 2^642439337 is an apocalyptic number.

It is an amenable number.

642439337 is a deficient number, since it is larger than the sum of its proper divisors (1).

642439337 is an equidigital number, since it uses as much as digits as its factorization.

642439337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 41.

The square root of 642439337 is about 25346.3870600920. The cubic root of 642439337 is about 862.8673613134.

The spelling of 642439337 in words is "six hundred forty-two million, four hundred thirty-nine thousand, three hundred thirty-seven".