1820629 has 2 divisors, whose sum is σ = 1820630. Its totient is φ = 1820628.

The previous prime is 1820617. The next prime is 1820633. The reversal of 1820629 is 9260281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1495729 + 324900 = 1223^2 + 570^2 .

It is an emirp because it is prime and its reverse (9260281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820629 - 2⁵ = 1820597 is a prime.

It is equal to p₁₃₆₄₉₅ and since 1820629 and 136495 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1820597 and 1820606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910314 + 910315.

It is an arithmetic number, because the mean of its divisors is an integer number (910315).

2^1820629 is an apocalyptic number.

It is an amenable number.

1820629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820629 is an equidigital number, since it uses as much as digits as its factorization.

1820629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1820629 is about 1349.3068590947. The cubic root of 1820629 is about 122.1069786373.

The spelling of 1820629 in words is "one million, eight hundred twenty thousand, six hundred twenty-nine".