3540420 has 144 divisors (see below), whose sum is σ = 12383280. Its totient is φ = 811008.

The previous prime is 3540401. The next prime is 3540421. The reversal of 3540420 is 240453.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 278784 + 3261636 = 528^2 + 1806^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 3540393 and 3540402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3540421) 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, 39736 + ... + 39824.

It is an arithmetic number, because the mean of its divisors is an integer number (85995).

Almost surely, 2^3540420 is an apocalyptic number.

3540420 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 3540420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6191640).

3540420 is an abundant number, since it is smaller than the sum of its proper divisors (8842860).

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

3540420 is a wasteful number, since it uses less digits than its factorization.

3540420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 3540420 is about 1881.6003826530. The cubic root of 3540420 is about 152.4116840609.

Adding to 3540420 its reverse (240453), we get a palindrome (3780873).

The spelling of 3540420 in words is "three million, five hundred forty thousand, four hundred twenty".