1918668839 has 2 divisors, whose sum is σ = 1918668840. Its totient is φ = 1918668838.

The previous prime is 1918668823. The next prime is 1918668863. The reversal of 1918668839 is 9388668191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1918668839 - 2⁴ = 1918668823 is a prime.

It is a super-2 number, since 2×1918668839² = 7362580227499215842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918661839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959334419 + 959334420.

It is an arithmetic number, because the mean of its divisors is an integer number (959334420).

Almost surely, 2^1918668839 is an apocalyptic number.

1918668839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918668839 is an equidigital number, since it uses as much as digits as its factorization.

1918668839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 59.

The square root of 1918668839 is about 43802.6122394544. The cubic root of 1918668839 is about 1242.6056980067.

The spelling of 1918668839 in words is "one billion, nine hundred eighteen million, six hundred sixty-eight thousand, eight hundred thirty-nine".