3500921 has 4 divisors (see below), whose sum is σ = 3685200. Its totient is φ = 3316644.

The previous prime is 3500897. The next prime is 3500941. The reversal of 3500921 is 1290053.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290053 = 179 ⋅7207.

It is a cyclic number.

It is not a de Polignac number, because 3500921 - 2¹⁰ = 3499897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3500893 and 3500902.

It is not an unprimeable number, because it can be changed into a prime (3500941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92111 + ... + 92148.

It is an arithmetic number, because the mean of its divisors is an integer number (921300).

Almost surely, 2^3500921 is an apocalyptic number.

It is an amenable number.

3500921 is a deficient number, since it is larger than the sum of its proper divisors (184279).

3500921 is a wasteful number, since it uses less digits than its factorization.

3500921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184278.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 3500921 is about 1871.0748247999. The cubic root of 3500921 is about 151.8427650374.

Adding to 3500921 its reverse (1290053), we get a palindrome (4790974).

The spelling of 3500921 in words is "three million, five hundred thousand, nine hundred twenty-one".