3547421 has 2 divisors, whose sum is σ = 3547422. Its totient is φ = 3547420.

The previous prime is 3547417. The next prime is 3547429. The reversal of 3547421 is 1247453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3463321 + 84100 = 1861^2 + 290^2 .

It is an emirp because it is prime and its reverse (1247453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3547421 - 2² = 3547417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3547429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1773710 + 1773711.

It is an arithmetic number, because the mean of its divisors is an integer number (1773711).

Almost surely, 2^3547421 is an apocalyptic number.

It is an amenable number.

3547421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3547421 is an equidigital number, since it uses as much as digits as its factorization.

3547421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 26.

The square root of 3547421 is about 1883.4598482580. The cubic root of 3547421 is about 152.5120800249.

Subtracting from 3547421 its reverse (1247453), we obtain a cube (2299968 = 132³).

The spelling of 3547421 in words is "three million, five hundred forty-seven thousand, four hundred twenty-one".