1966431739 has 16 divisors (see below), whose sum is σ = 2070921600. Its totient is φ = 1864646784.

The previous prime is 1966431707. The next prime is 1966431781. The reversal of 1966431739 is 9371346691.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1966431739 - 2⁵ = 1966431707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966431692 and 1966431701.

It is not an unprimeable number, because it can be changed into a prime (1966431799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449149 + ... + 453505.

It is an arithmetic number, because the mean of its divisors is an integer number (129432600).

Almost surely, 2^1966431739 is an apocalyptic number.

1966431739 is a deficient number, since it is larger than the sum of its proper divisors (104489861).

1966431739 is a wasteful number, since it uses less digits than its factorization.

1966431739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662.

The product of its digits is 734832, while the sum is 49.

The square root of 1966431739 is about 44344.4668363484. The cubic root of 1966431739 is about 1252.8323483815.

The spelling of 1966431739 in words is "one billion, nine hundred sixty-six million, four hundred thirty-one thousand, seven hundred thirty-nine".