1646413 has 2 divisors, whose sum is σ = 1646414. Its totient is φ = 1646412.

The previous prime is 1646387. The next prime is 1646423. The reversal of 1646413 is 3146461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1646089 + 324 = 1283^2 + 18^2 .

It is an emirp because it is prime and its reverse (3146461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1646413 - 2⁹ = 1645901 is a prime.

1646413 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823206 + 823207.

It is an arithmetic number, because the mean of its divisors is an integer number (823207).

2^1646413 is an apocalyptic number.

It is an amenable number.

1646413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646413 is an equidigital number, since it uses as much as digits as its factorization.

1646413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 1646413 is about 1283.1262603501. The cubic root of 1646413 is about 118.0808839301.

The spelling of 1646413 in words is "one million, six hundred forty-six thousand, four hundred thirteen".