3896021 has 4 divisors (see below), whose sum is σ = 3909612. Its totient is φ = 3882432.

The previous prime is 3896017. The next prime is 3896023. The reversal of 3896021 is 1206983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1206983 = 17 ⋅70999.

It can be written as a sum of positive squares in 2 ways, for example, as 1612900 + 2283121 = 1270^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 3896021 - 2² = 3896017 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 (3896023) 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, 6356 + ... + 6941.

It is an arithmetic number, because the mean of its divisors is an integer number (977403).

Almost surely, 2^3896021 is an apocalyptic number.

It is an amenable number.

3896021 is a deficient number, since it is larger than the sum of its proper divisors (13591).

3896021 is a wasteful number, since it uses less digits than its factorization.

3896021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13590.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 3896021 is about 1973.8340862393. The cubic root of 3896021 is about 157.3525419228.

The spelling of 3896021 in words is "three million, eight hundred ninety-six thousand, twenty-one".