1620347 has 2 divisors, whose sum is σ = 1620348. Its totient is φ = 1620346.

The previous prime is 1620337. The next prime is 1620371. The reversal of 1620347 is 7430261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620347 - 2⁴ = 1620331 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1620337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810173 + 810174.

It is an arithmetic number, because the mean of its divisors is an integer number (810174).

2^1620347 is an apocalyptic number.

1620347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620347 is an equidigital number, since it uses as much as digits as its factorization.

1620347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1620347 is about 1272.9285133109. The cubic root of 1620347 is about 117.4544141862.

The spelling of 1620347 in words is "one million, six hundred twenty thousand, three hundred forty-seven".