1822720738 has 4 divisors (see below), whose sum is σ = 2734081110. Its totient is φ = 911360368.

The previous prime is 1822720727. The next prime is 1822720741. The reversal of 1822720738 is 8370272281.

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., 1793268409 + 29452329 = 42347^2 + 5427^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1822720738.

It is an unprimeable number.

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, 455680183 + ... + 455680186.

Almost surely, 2^1822720738 is an apocalyptic number.

1822720738 is a deficient number, since it is larger than the sum of its proper divisors (911360372).

1822720738 is an equidigital number, since it uses as much as digits as its factorization.

1822720738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911360371.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 1822720738 is about 42693.3336482407. Note that the first 3 decimals coincide. The cubic root of 1822720738 is about 1221.5372403012.

The spelling of 1822720738 in words is "one billion, eight hundred twenty-two million, seven hundred twenty thousand, seven hundred thirty-eight".