1373721818 has 8 divisors (see below), whose sum is σ = 2354951712. Its totient is φ = 588737916.

The previous prime is 1373721799. The next prime is 1373721821. The reversal of 1373721818 is 8181273731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1373721818² = 3774223266498450248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49061480 + ... + 49061507.

It is an arithmetic number, because the mean of its divisors is an integer number (294368964).

Almost surely, 2^1373721818 is an apocalyptic number.

1373721818 is a deficient number, since it is larger than the sum of its proper divisors (981229894).

1373721818 is an equidigital number, since it uses as much as digits as its factorization.

1373721818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98122996.

The product of its digits is 56448, while the sum is 41.

The square root of 1373721818 is about 37063.7534256853. The cubic root of 1373721818 is about 1111.6453746658.

The spelling of 1373721818 in words is "one billion, three hundred seventy-three million, seven hundred twenty-one thousand, eight hundred eighteen".