3946921 has 4 divisors (see below), whose sum is σ = 4305744. Its totient is φ = 3588100.

The previous prime is 3946913. The next prime is 3946933. The reversal of 3946921 is 1296493.

3946921 = 594² + 595² + ... + 604².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3946921 - 2³ = 3946913 is a prime.

It is a Duffinian number.

3946921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3946981) 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, 179395 + ... + 179416.

It is an arithmetic number, because the mean of its divisors is an integer number (1076436).

Almost surely, 2^3946921 is an apocalyptic number.

It is an amenable number.

3946921 is a deficient number, since it is larger than the sum of its proper divisors (358823).

3946921 is a wasteful number, since it uses less digits than its factorization.

3946921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358822.

The product of its digits is 11664, while the sum is 34.

The square root of 3946921 is about 1986.6859339110. The cubic root of 3946921 is about 158.0348291535.

The spelling of 3946921 in words is "three million, nine hundred forty-six thousand, nine hundred twenty-one".