3705421 has 2 divisors, whose sum is σ = 3705422. Its totient is φ = 3705420.

The previous prime is 3705409. The next prime is 3705431. The reversal of 3705421 is 1245073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3663396 + 42025 = 1914^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 3705421 - 2¹¹ = 3703373 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3705392 and 3705401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3705431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1852710 + 1852711.

It is an arithmetic number, because the mean of its divisors is an integer number (1852711).

Almost surely, 2^3705421 is an apocalyptic number.

It is an amenable number.

3705421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3705421 is an equidigital number, since it uses as much as digits as its factorization.

3705421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 3705421 is about 1924.9470122577. The cubic root of 3705421 is about 154.7435370421.

The spelling of 3705421 in words is "three million, seven hundred five thousand, four hundred twenty-one".