4038421 has 2 divisors, whose sum is σ = 4038422. Its totient is φ = 4038420.

The previous prime is 4038413. The next prime is 4038443. The reversal of 4038421 is 1248304.

It is an a-pointer prime, because the next prime (4038443) can be obtained adding 4038421 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 1028196 = 1735^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 4038421 - 2³ = 4038413 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4038392 and 4038401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4038451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2019210 + 2019211.

It is an arithmetic number, because the mean of its divisors is an integer number (2019211).

Almost surely, 2^4038421 is an apocalyptic number.

It is an amenable number.

4038421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4038421 is an equidigital number, since it uses as much as digits as its factorization.

4038421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 4038421 is about 2009.5822949061. The cubic root of 4038421 is about 159.2467326799.

The spelling of 4038421 in words is "four million, thirty-eight thousand, four hundred twenty-one".