1939834891 has 2 divisors, whose sum is σ = 1939834892. Its totient is φ = 1939834890.

The previous prime is 1939834847. The next prime is 1939834903. The reversal of 1939834891 is 1984389391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1939834891 - 2²⁵ = 1906280459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939832891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969917445 + 969917446.

It is an arithmetic number, because the mean of its divisors is an integer number (969917446).

Almost surely, 2^1939834891 is an apocalyptic number.

1939834891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939834891 is an equidigital number, since it uses as much as digits as its factorization.

1939834891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 55.

The square root of 1939834891 is about 44043.5567478377. The cubic root of 1939834891 is about 1247.1583215328.

It can be divided in two parts, 19398 and 34891, that added together give a square (54289 = 233²).

The spelling of 1939834891 in words is "one billion, nine hundred thirty-nine million, eight hundred thirty-four thousand, eight hundred ninety-one".