1620469 has 2 divisors, whose sum is σ = 1620470. Its totient is φ = 1620468.

The previous prime is 1620467. The next prime is 1620497. The reversal of 1620469 is 9640261.

It is an a-pointer prime, because the next prime (1620497) can be obtained adding 1620469 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 7569 = 1270^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620469 - 2¹ = 1620467 is a prime.

It is a super-2 number, since 2×1620469² = 5251839559922, which contains 22 as substring.

Together with 1620467, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620461) 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, 810234 + 810235.

It is an arithmetic number, because the mean of its divisors is an integer number (810235).

2^1620469 is an apocalyptic number.

It is an amenable number.

1620469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620469 is an equidigital number, since it uses as much as digits as its factorization.

1620469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1620469 is about 1272.9764334032. The cubic root of 1620469 is about 117.4573619250.

The spelling of 1620469 in words is "one million, six hundred twenty thousand, four hundred sixty-nine".