3520404 has 18 divisors (see below), whose sum is σ = 8898890. Its totient is φ = 1173456.

The previous prime is 3520399. The next prime is 3520427. The reversal of 3520404 is 4040253.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3027600 + 492804 = 1740^2 + 702^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

3520404 is a modest number, since divided by 404 gives 352 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48859 + ... + 48930.

Almost surely, 2^3520404 is an apocalyptic number.

It is an amenable number.

3520404 is an abundant number, since it is smaller than the sum of its proper divisors (5378486).

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

3520404 is a wasteful number, since it uses less digits than its factorization.

3520404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97799 (or 97794 counting only the distinct ones).

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

The square root of 3520404 is about 1876.2739672020. The cubic root of 3520404 is about 152.1239178775.

Adding to 3520404 its reverse (4040253), we get a palindrome (7560657).

The spelling of 3520404 in words is "three million, five hundred twenty thousand, four hundred four".