3962821 has 4 divisors (see below), whose sum is σ = 4099500. Its totient is φ = 3826144.

The previous prime is 3962813. The next prime is 3962839. The reversal of 3962821 is 1282693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3132900 + 829921 = 1770^2 + 911^2 .

It is not a de Polignac number, because 3962821 - 2³ = 3962813 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 (3962851) 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, 68296 + ... + 68353.

It is an arithmetic number, because the mean of its divisors is an integer number (1024875).

Almost surely, 2^3962821 is an apocalyptic number.

It is an amenable number.

3962821 is a deficient number, since it is larger than the sum of its proper divisors (136679).

3962821 is a wasteful number, since it uses less digits than its factorization.

3962821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136678.

The product of its digits is 5184, while the sum is 31.

The square root of 3962821 is about 1990.6835509442. The cubic root of 3962821 is about 158.2467569779.

The spelling of 3962821 in words is "three million, nine hundred sixty-two thousand, eight hundred twenty-one".