1238018797 has 4 divisors (see below), whose sum is σ = 1238090620. Its totient is φ = 1237946976.

The previous prime is 1238018791. The next prime is 1238018801. The reversal of 1238018797 is 7978108321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 418857156 + 819161641 = 20466^2 + 28621^2 .

It is a 3-Lehmer number, since φ(1238018797) divides (1238018797-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1238018797 - 2⁷ = 1238018669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238018791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7183 + ... + 50275.

It is an arithmetic number, because the mean of its divisors is an integer number (309522655).

It is a Poulet number, since it divides 2^1238018796-1.

Almost surely, 2^1238018797 is an apocalyptic number.

1238018797 is the 28729-th pentagonal number.

It is an amenable number.

1238018797 is a deficient number, since it is larger than the sum of its proper divisors (71823).

1238018797 is an equidigital number, since it uses as much as digits as its factorization.

1238018797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71822.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 1238018797 is about 35185.4912854716. The cubic root of 1238018797 is about 1073.7645939932.

The spelling of 1238018797 in words is "one billion, two hundred thirty-eight million, eighteen thousand, seven hundred ninety-seven".