3821691 has 8 divisors (see below), whose sum is σ = 5104960. Its totient is φ = 2543112.

The previous prime is 3821689. The next prime is 3821723. The reversal of 3821691 is 1961283.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3821691 - 2¹ = 3821689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3821681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1836 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (638120).

Almost surely, 2^3821691 is an apocalyptic number.

3821691 is a deficient number, since it is larger than the sum of its proper divisors (1283269).

3821691 is a wasteful number, since it uses less digits than its factorization.

3821691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345.

The product of its digits is 2592, while the sum is 30.

The square root of 3821691 is about 1954.9145761388. The cubic root of 3821691 is about 156.3454294914.

Adding to 3821691 its product of digits (2592), we get a palindrome (3824283).

The spelling of 3821691 in words is "three million, eight hundred twenty-one thousand, six hundred ninety-one".