3708921 has 4 divisors (see below), whose sum is σ = 4945232. Its totient is φ = 2472612.

The previous prime is 3708899. The next prime is 3708923. The reversal of 3708921 is 1298073.

It is a happy number.

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.

It is not a de Polignac number, because 3708921 - 2⁵ = 3708889 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3708923) 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, 618151 + ... + 618156.

It is an arithmetic number, because the mean of its divisors is an integer number (1236308).

Almost surely, 2^3708921 is an apocalyptic number.

It is an amenable number.

3708921 is a deficient number, since it is larger than the sum of its proper divisors (1236311).

3708921 is a wasteful number, since it uses less digits than its factorization.

3708921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236310.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3708921 is about 1925.8559136135. The cubic root of 3708921 is about 154.7922433333.

The spelling of 3708921 in words is "three million, seven hundred eight thousand, nine hundred twenty-one".