3698821 has 4 divisors (see below), whose sum is σ = 4227232. Its totient is φ = 3170412.

The previous prime is 3698819. The next prime is 3698831. The reversal of 3698821 is 1288963.

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 3698821 - 2¹ = 3698819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3698801) 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, 264195 + ... + 264208.

It is an arithmetic number, because the mean of its divisors is an integer number (1056808).

Almost surely, 2^3698821 is an apocalyptic number.

It is an amenable number.

3698821 is a deficient number, since it is larger than the sum of its proper divisors (528411).

3698821 is an equidigital number, since it uses as much as digits as its factorization.

3698821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528410.

The product of its digits is 20736, while the sum is 37.

The square root of 3698821 is about 1923.2319152926. The cubic root of 3698821 is about 154.6516073782.

The spelling of 3698821 in words is "three million, six hundred ninety-eight thousand, eight hundred twenty-one".