3872121 has 12 divisors (see below), whose sum is σ = 5675376. Its totient is φ = 2346520.

The previous prime is 3872101. The next prime is 3872129. The reversal of 3872121 is 1212783.

It is not a de Polignac number, because 3872121 - 2¹¹ = 3870073 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 3872091 and 3872100.

It is not an unprimeable number, because it can be changed into a prime (3872129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4971 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (472948).

Almost surely, 2^3872121 is an apocalyptic number.

It is an amenable number.

3872121 is a deficient number, since it is larger than the sum of its proper divisors (1803255).

3872121 is a wasteful number, since it uses less digits than its factorization.

3872121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692 (or 10681 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 3872121 is about 1967.7705658943. The cubic root of 3872121 is about 157.0301239072.

It can be divided in two parts, 3872 and 121, that added together give a palindrome (3993).

The spelling of 3872121 in words is "three million, eight hundred seventy-two thousand, one hundred twenty-one".