1966419839 has 4 divisors (see below), whose sum is σ = 2069915640. Its totient is φ = 1862924040.

The previous prime is 1966419827. The next prime is 1966419863. The reversal of 1966419839 is 9389146691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9389146691 = 29 ⋅323763679.

It is a cyclic number.

It is not a de Polignac number, because 1966419839 - 2¹² = 1966415743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966419809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51747872 + ... + 51747909.

It is an arithmetic number, because the mean of its divisors is an integer number (517478910).

Almost surely, 2^1966419839 is an apocalyptic number.

1966419839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1966419839 is a deficient number, since it is larger than the sum of its proper divisors (103495801).

1966419839 is a wasteful number, since it uses less digits than its factorization.

1966419839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103495800.

The product of its digits is 2519424, while the sum is 56.

The square root of 1966419839 is about 44344.3326593151. The cubic root of 1966419839 is about 1252.8298211754.

The spelling of 1966419839 in words is "one billion, nine hundred sixty-six million, four hundred nineteen thousand, eight hundred thirty-nine".