3521786738 has 18 divisors (see below), whose sum is σ = 5474906541. Its totient is φ = 1698997944.

The previous prime is 3521786729. The next prime is 3521786753. The reversal of 3521786738 is 8376871253.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3519692929 + 2093809 = 59327^2 + 1447^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=41963.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2433131 + ... + 2434577.

Almost surely, 2^3521786738 is an apocalyptic number.

3521786738 is a deficient number, since it is larger than the sum of its proper divisors (1953119803).

3521786738 is an frugal number, since it uses more digits than its factorization.

3521786738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954 (or 1478 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 50.

The square root of 3521786738 is about 59344.6437178622. The cubic root of 3521786738 is about 1521.4383225740.

Multiplying 3521786738 by its sum of digits (50), we get a square (176089336900 = 419630²).

The spelling of 3521786738 in words is "three billion, five hundred twenty-one million, seven hundred eighty-six thousand, seven hundred thirty-eight".