3726421 has 2 divisors, whose sum is σ = 3726422. Its totient is φ = 3726420.

The previous prime is 3726419. The next prime is 3726439. The reversal of 3726421 is 1246273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3724900 + 1521 = 1930^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 3726421 - 2¹ = 3726419 is a prime.

Together with 3726419, it forms a pair of twin primes.

3726421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3726461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1863210 + 1863211.

It is an arithmetic number, because the mean of its divisors is an integer number (1863211).

Almost surely, 2^3726421 is an apocalyptic number.

It is an amenable number.

3726421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3726421 is an equidigital number, since it uses as much as digits as its factorization.

3726421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 3726421 is about 1930.3940012339. The cubic root of 3726421 is about 155.0353162676.

The spelling of 3726421 in words is "three million, seven hundred twenty-six thousand, four hundred twenty-one".