442639537 has 2 divisors, whose sum is σ = 442639538. Its totient is φ = 442639536.

The previous prime is 442639507. The next prime is 442639541. The reversal of 442639537 is 735936244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442639521 + 16 = 21039^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 442639537 - 2²⁷ = 308421809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442639493 and 442639502.

It is not a weakly prime, because it can be changed into another prime (442639507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221319768 + 221319769.

It is an arithmetic number, because the mean of its divisors is an integer number (221319769).

Almost surely, 2^442639537 is an apocalyptic number.

It is an amenable number.

442639537 is a deficient number, since it is larger than the sum of its proper divisors (1).

442639537 is an equidigital number, since it uses as much as digits as its factorization.

442639537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 43.

The square root of 442639537 is about 21039.0003802462. Note that the first 3 decimals coincide. The cubic root of 442639537 is about 762.1083751543.

The spelling of 442639537 in words is "four hundred forty-two million, six hundred thirty-nine thousand, five hundred thirty-seven".