494439637 has 2 divisors, whose sum is σ = 494439638. Its totient is φ = 494439636.

The previous prime is 494439593. The next prime is 494439643. The reversal of 494439637 is 736934494.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350775441 + 143664196 = 18729^2 + 11986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494439637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494439667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247219818 + 247219819.

It is an arithmetic number, because the mean of its divisors is an integer number (247219819).

Almost surely, 2^494439637 is an apocalyptic number.

It is an amenable number.

494439637 is a deficient number, since it is larger than the sum of its proper divisors (1).

494439637 is an equidigital number, since it uses as much as digits as its factorization.

494439637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 49.

The square root of 494439637 is about 22235.9986733225. The cubic root of 494439637 is about 790.7473763650.

The spelling of 494439637 in words is "four hundred ninety-four million, four hundred thirty-nine thousand, six hundred thirty-seven".