3971121 has 16 divisors (see below), whose sum is σ = 6601728. Its totient is φ = 2062800.

The previous prime is 3971119. The next prime is 3971129. The reversal of 3971121 is 1211793.

It is not a de Polignac number, because 3971121 - 2¹ = 3971119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3971091 and 3971100.

It is not an unprimeable number, because it can be changed into a prime (3971129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8365 + ... + 8826.

It is an arithmetic number, because the mean of its divisors is an integer number (412608).

Almost surely, 2^3971121 is an apocalyptic number.

It is an amenable number.

3971121 is a deficient number, since it is larger than the sum of its proper divisors (2630607).

3971121 is a wasteful number, since it uses less digits than its factorization.

3971121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17212.

The product of its digits is 378, while the sum is 24.

The square root of 3971121 is about 1992.7671715481. The cubic root of 3971121 is about 158.3571608339.

The spelling of 3971121 in words is "three million, nine hundred seventy-one thousand, one hundred twenty-one".