5639749 has 2 divisors, whose sum is σ = 5639750. Its totient is φ = 5639748.

The previous prime is 5639741. The next prime is 5639759. The reversal of 5639749 is 9479365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 2010724 = 1905^2 + 1418^2 .

It is a cyclic number.

It is not a de Polignac number, because 5639749 - 2³ = 5639741 is a prime.

5639749 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5639741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819874 + 2819875.

It is an arithmetic number, because the mean of its divisors is an integer number (2819875).

Almost surely, 2^5639749 is an apocalyptic number.

It is an amenable number.

5639749 is a deficient number, since it is larger than the sum of its proper divisors (1).

5639749 is an equidigital number, since it uses as much as digits as its factorization.

5639749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 5639749 is about 2374.8155717866. The cubic root of 5639749 is about 177.9999684383. Note that the first 4 decimals are identical.

The spelling of 5639749 in words is "five million, six hundred thirty-nine thousand, seven hundred forty-nine".