3520639 has 6 divisors (see below), whose sum is σ = 3645024. Its totient is φ = 3396960.

The previous prime is 3520613. The next prime is 3520663. The reversal of 3520639 is 9360253.

It is not a de Polignac number, because 3520639 - 2⁵ = 3520607 is a prime.

It is a Duffinian number.

3520639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3520669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10279 + ... + 10615.

It is an arithmetic number, because the mean of its divisors is an integer number (607504).

Almost surely, 2^3520639 is an apocalyptic number.

3520639 is a deficient number, since it is larger than the sum of its proper divisors (124385).

3520639 is an frugal number, since it uses more digits than its factorization.

3520639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 3520639 is about 1876.3365902737. The cubic root of 3520639 is about 152.1273027471.

It can be divided in two parts, 35206 and 39, that added together give a triangular number (35245 = T₂₆₅).

The spelling of 3520639 in words is "three million, five hundred twenty thousand, six hundred thirty-nine".