3549780 has 144 divisors (see below), whose sum is σ = 12199824. Its totient is φ = 829440.

The previous prime is 3549757. The next prime is 3549811. The reversal of 3549780 is 879453.

3549780 is a nontrivial binomial coefficient, being equal to C(2665, 2).

It can be written as a sum of positive squares in 8 ways, for example, as 352836 + 3196944 = 594^2 + 1788^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86560 + ... + 86600.

It is an arithmetic number, because the mean of its divisors is an integer number (84721).

Almost surely, 2^3549780 is an apocalyptic number.

3549780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3549780 is the 2664-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3549780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6099912).

3549780 is an abundant number, since it is smaller than the sum of its proper divisors (8650044).

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

3549780 is a wasteful number, since it uses less digits than its factorization.

3549780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 3549780 is about 1884.0859852990. The cubic root of 3549780 is about 152.5458788774.

The spelling of 3549780 in words is "three million, five hundred forty-nine thousand, seven hundred eighty".