1620887 has 2 divisors, whose sum is σ = 1620888. Its totient is φ = 1620886.

The previous prime is 1620881. The next prime is 1620893. The reversal of 1620887 is 7880261.

It is a balanced prime because it is at equal distance from previous prime (1620881) and next prime (1620893).

It is an emirp because it is prime and its reverse (7880261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620887 - 2⁶ = 1620823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620881) 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, 810443 + 810444.

It is an arithmetic number, because the mean of its divisors is an integer number (810444).

2^1620887 is an apocalyptic number.

1620887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620887 is an equidigital number, since it uses as much as digits as its factorization.

1620887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1620887 is about 1273.1406049608. The cubic root of 1620887 is about 117.4674604328.

The spelling of 1620887 in words is "one million, six hundred twenty thousand, eight hundred eighty-seven".