4021693 has 12 divisors (see below), whose sum is σ = 4446900. Its totient is φ = 3634176.

The previous prime is 4021663. The next prime is 4021727. The reversal of 4021693 is 3961204.

It can be written as a sum of positive squares in 6 ways, for example, as 191844 + 3829849 = 438^2 + 1957^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4021693 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8733 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (370575).

Almost surely, 2^4021693 is an apocalyptic number.

It is an amenable number.

4021693 is a deficient number, since it is larger than the sum of its proper divisors (425207).

4021693 is a wasteful number, since it uses less digits than its factorization.

4021693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 4021693 is about 2005.4159169609. The cubic root of 4021693 is about 159.0265504230.

Adding to 4021693 its reverse (3961204), we get a palindrome (7982897).

The spelling of 4021693 in words is "four million, twenty-one thousand, six hundred ninety-three".