1966431693 has 8 divisors (see below), whose sum is σ = 2633162688. Its totient is φ = 1305327584.

The previous prime is 1966431683. The next prime is 1966431707. The reversal of 1966431693 is 3961346691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966431693 - 2¹² = 1966427597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966431673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405905 + ... + 1407302.

It is an arithmetic number, because the mean of its divisors is an integer number (329145336).

Almost surely, 2^1966431693 is an apocalyptic number.

It is an amenable number.

1966431693 is a deficient number, since it is larger than the sum of its proper divisors (666730995).

1966431693 is a wasteful number, since it uses less digits than its factorization.

1966431693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813443.

The product of its digits is 629856, while the sum is 48.

The square root of 1966431693 is about 44344.4663176816. The cubic root of 1966431693 is about 1252.8323386125.

The spelling of 1966431693 in words is "one billion, nine hundred sixty-six million, four hundred thirty-one thousand, six hundred ninety-three".