1945199 has 2 divisors, whose sum is σ = 1945200. Its totient is φ = 1945198.

The previous prime is 1945183. The next prime is 1945243. The reversal of 1945199 is 9915491.

It is a weak prime.

It is an emirp because it is prime and its reverse (9915491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1945199 - 2⁴ = 1945183 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972599 + 972600.

It is an arithmetic number, because the mean of its divisors is an integer number (972600).

2^1945199 is an apocalyptic number.

1945199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945199 is an equidigital number, since it uses as much as digits as its factorization.

1945199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 1945199 is about 1394.7039112299. The cubic root of 1945199 is about 124.8306827569.

The spelling of 1945199 in words is "one million, nine hundred forty-five thousand, one hundred ninety-nine".