1820738 has 4 divisors (see below), whose sum is σ = 2731110. Its totient is φ = 910368.

The previous prime is 1820737. The next prime is 1820743. The reversal of 1820738 is 8370281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1247689 + 573049 = 1117^2 + 757^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1820738.

It is not an unprimeable number, because it can be changed into a prime (1820737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455183 + ... + 455186.

2^1820738 is an apocalyptic number.

1820738 is a deficient number, since it is larger than the sum of its proper divisors (910372).

1820738 is an equidigital number, since it uses as much as digits as its factorization.

1820738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910371.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1820738 is about 1349.3472495989. The cubic root of 1820738 is about 122.1094154133.

The spelling of 1820738 in words is "one million, eight hundred twenty thousand, seven hundred thirty-eight".