4021916 has 12 divisors (see below), whose sum is σ = 7104888. Its totient is φ = 1991952.

The previous prime is 4021907. The next prime is 4021933. The reversal of 4021916 is 6191204.

It is a happy number.

It is a super-2 number, since 2×4021916² = 32351616622112, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 4021891 and 4021900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (592074).

Almost surely, 2^4021916 is an apocalyptic number.

It is an amenable number.

4021916 is a deficient number, since it is larger than the sum of its proper divisors (3082972).

4021916 is a wasteful number, since it uses less digits than its factorization.

4021916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508 (or 9506 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 4021916 is about 2005.4715156292. The cubic root of 4021916 is about 159.0294896715.

The spelling of 4021916 in words is "four million, twenty-one thousand, nine hundred sixteen".