1932397891 has 2 divisors, whose sum is σ = 1932397892. Its totient is φ = 1932397890.

The previous prime is 1932397879. The next prime is 1932397931. The reversal of 1932397891 is 1987932391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1932397891 - 2²¹ = 1930300739 is a prime.

It is not a weakly prime, because it can be changed into another prime (1932397091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 966198945 + 966198946.

It is an arithmetic number, because the mean of its divisors is an integer number (966198946).

Almost surely, 2^1932397891 is an apocalyptic number.

1932397891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1932397891 is an equidigital number, since it uses as much as digits as its factorization.

1932397891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 1932397891 is about 43959.0478855036. The cubic root of 1932397891 is about 1245.5624821363.

The spelling of 1932397891 in words is "one billion, nine hundred thirty-two million, three hundred ninety-seven thousand, eight hundred ninety-one".