1373721819 has 4 divisors (see below), whose sum is σ = 1831629096. Its totient is φ = 915814544.

The previous prime is 1373721799. The next prime is 1373721821. The reversal of 1373721819 is 9181273731.

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

It is a cyclic number.

It is not a de Polignac number, because 1373721819 - 2⁷ = 1373721691 is a prime.

It is a super-2 number, since 2×1373721819² = 3774223271993337522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1373721119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228953634 + ... + 228953639.

It is an arithmetic number, because the mean of its divisors is an integer number (457907274).

Almost surely, 2^1373721819 is an apocalyptic number.

1373721819 is a deficient number, since it is larger than the sum of its proper divisors (457907277).

1373721819 is an equidigital number, since it uses as much as digits as its factorization.

1373721819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457907276.

The product of its digits is 63504, while the sum is 42.

The square root of 1373721819 is about 37063.7534391756. The cubic root of 1373721819 is about 1111.6453749355.

The spelling of 1373721819 in words is "one billion, three hundred seventy-three million, seven hundred twenty-one thousand, eight hundred nineteen".