4545639 has 20 divisors (see below), whose sum is σ = 7761424. Its totient is φ = 2597184.

The previous prime is 4545601. The next prime is 4545641. The reversal of 4545639 is 9365454.

It is a happy number.

It is not a de Polignac number, because 4545639 - 2²⁰ = 3497063 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4545689) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3442 + ... + 4575.

Almost surely, 2^4545639 is an apocalyptic number.

4545639 is a deficient number, since it is larger than the sum of its proper divisors (3215785).

4545639 is an equidigital number, since it uses as much as digits as its factorization.

4545639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8036 (or 8027 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 4545639 is about 2132.0504215426. The cubic root of 4545639 is about 165.6526219032.

It can be divided in two parts, 4545 and 639, that added together give a square (5184 = 72²).

The spelling of 4545639 in words is "four million, five hundred forty-five thousand, six hundred thirty-nine".