1945377839 has 2 divisors, whose sum is σ = 1945377840. Its totient is φ = 1945377838.

The previous prime is 1945377809. The next prime is 1945377851. The reversal of 1945377839 is 9387735491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1945377839 - 2²⁰ = 1944329263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945377809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972688919 + 972688920.

It is an arithmetic number, because the mean of its divisors is an integer number (972688920).

Almost surely, 2^1945377839 is an apocalyptic number.

1945377839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945377839 is an equidigital number, since it uses as much as digits as its factorization.

1945377839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 56.

The square root of 1945377839 is about 44106.4376140264. The cubic root of 1945377839 is about 1248.3450822848.

The spelling of 1945377839 in words is "one billion, nine hundred forty-five million, three hundred seventy-seven thousand, eight hundred thirty-nine".