1209390019 has 2 divisors, whose sum is σ = 1209390020. Its totient is φ = 1209390018.

The previous prime is 1209389981. The next prime is 1209390067. The reversal of 1209390019 is 9100939021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1209390019 - 2⁷ = 1209389891 is a prime.

It is a super-2 number, since 2×1209390019² = 2925248436113640722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1209390419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604695009 + 604695010.

It is an arithmetic number, because the mean of its divisors is an integer number (604695010).

Almost surely, 2^1209390019 is an apocalyptic number.

1209390019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209390019 is an equidigital number, since it uses as much as digits as its factorization.

1209390019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 1209390019 is about 34776.2852961612. The cubic root of 1209390019 is about 1065.4231441018.

The spelling of 1209390019 in words is "one billion, two hundred nine million, three hundred ninety thousand, nineteen".