1800125399 has 2 divisors, whose sum is σ = 1800125400. Its totient is φ = 1800125398.

The previous prime is 1800125389. The next prime is 1800125407. The reversal of 1800125399 is 9935210081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1800125399 - 2²⁰ = 1799076823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800125389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900062699 + 900062700.

It is an arithmetic number, because the mean of its divisors is an integer number (900062700).

Almost surely, 2^1800125399 is an apocalyptic number.

1800125399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800125399 is an equidigital number, since it uses as much as digits as its factorization.

1800125399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1800125399 is about 42427.8846868424. The cubic root of 1800125399 is about 1216.4686466827.

The spelling of 1800125399 in words is "one billion, eight hundred million, one hundred twenty-five thousand, three hundred ninety-nine".