1819672139 has 2 divisors, whose sum is σ = 1819672140. Its totient is φ = 1819672138.

The previous prime is 1819672103. The next prime is 1819672157. The reversal of 1819672139 is 9312769181.

It is a strong prime.

It is an emirp because it is prime and its reverse (9312769181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1819672139 - 2²⁰ = 1818623563 is a prime.

It is a super-2 number, since 2×1819672139² = 6622413386905670642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1819672093 and 1819672102.

It is not a weakly prime, because it can be changed into another prime (1819672189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909836069 + 909836070.

It is an arithmetic number, because the mean of its divisors is an integer number (909836070).

Almost surely, 2^1819672139 is an apocalyptic number.

1819672139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819672139 is an equidigital number, since it uses as much as digits as its factorization.

1819672139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 1819672139 is about 42657.6152521446. The cubic root of 1819672139 is about 1220.8558312319.

The spelling of 1819672139 in words is "one billion, eight hundred nineteen million, six hundred seventy-two thousand, one hundred thirty-nine".