1945919 has 2 divisors, whose sum is σ = 1945920. Its totient is φ = 1945918.

The previous prime is 1945913. The next prime is 1945943. The reversal of 1945919 is 9195491.

It is a weak prime.

It is an emirp because it is prime and its reverse (9195491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1945919 - 2⁴ = 1945903 is a prime.

It is a super-2 number, since 2×1945919² = 7573201509122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972959 + 972960.

It is an arithmetic number, because the mean of its divisors is an integer number (972960).

2^1945919 is an apocalyptic number.

1945919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945919 is an equidigital number, since it uses as much as digits as its factorization.

1945919 is an evil number, because the sum of its binary digits is even.

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

The square root of 1945919 is about 1394.9620066511. The cubic root of 1945919 is about 124.8460825531.

The spelling of 1945919 in words is "one million, nine hundred forty-five thousand, nine hundred nineteen".