3509820 has 144 divisors (see below), whose sum is σ = 11950848. Its totient is φ = 829440.

The previous prime is 3509801. The next prime is 3509827. The reversal of 3509820 is 289053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3509827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94842 + ... + 94878.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

Almost surely, 2^3509820 is an apocalyptic number.

3509820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3509820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5975424).

3509820 is an abundant number, since it is smaller than the sum of its proper divisors (8441028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3509820 is a wasteful number, since it uses less digits than its factorization.

3509820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 3509820 is about 1873.4513604575. The cubic root of 3509820 is about 151.9713126840.

The spelling of 3509820 in words is "three million, five hundred nine thousand, eight hundred twenty".