3520731 has 8 divisors (see below), whose sum is σ = 4728640. Its totient is φ = 2329992.

The previous prime is 3520729. The next prime is 3520733. The reversal of 3520731 is 1370253.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3520729) and next prime (3520733).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3520731 - 2¹ = 3520729 is a prime.

It is a super-3 number, since 3×3520731³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3520698 and 3520707.

It is not an unprimeable number, because it can be changed into a prime (3520733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3805 + ... + 4638.

It is an arithmetic number, because the mean of its divisors is an integer number (591080).

Almost surely, 2^3520731 is an apocalyptic number.

3520731 is a deficient number, since it is larger than the sum of its proper divisors (1207909).

3520731 is a wasteful number, since it uses less digits than its factorization.

3520731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8585.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 3520731 is about 1876.3611059708. The cubic root of 3520731 is about 152.1286278465.

Adding to 3520731 its reverse (1370253), we get a palindrome (4890984).

The spelling of 3520731 in words is "three million, five hundred twenty thousand, seven hundred thirty-one".