1622749 has 2 divisors, whose sum is σ = 1622750. Its totient is φ = 1622748.

The previous prime is 1622743. The next prime is 1622773. The reversal of 1622749 is 9472261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1397124 + 225625 = 1182^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622749 - 2¹⁵ = 1589981 is a prime.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1622749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1622743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811374 + 811375.

It is an arithmetic number, because the mean of its divisors is an integer number (811375).

2^1622749 is an apocalyptic number.

It is an amenable number.

1622749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622749 is an equidigital number, since it uses as much as digits as its factorization.

1622749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 1622749 is about 1273.8716575856. The cubic root of 1622749 is about 117.5124236147.

The spelling of 1622749 in words is "one million, six hundred twenty-two thousand, seven hundred forty-nine".