1966739 has 4 divisors (see below), whose sum is σ = 1979424. Its totient is φ = 1954056.

The previous prime is 1966697. The next prime is 1966787. The reversal of 1966739 is 9376691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9376691 = 137 ⋅68443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1966739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966696 and 1966705.

It is not an unprimeable number, because it can be changed into a prime (1968739) 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, 6107 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (494856).

2^1966739 is an apocalyptic number.

1966739 is a deficient number, since it is larger than the sum of its proper divisors (12685).

1966739 is a wasteful number, since it uses less digits than its factorization.

1966739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12684.

The product of its digits is 61236, while the sum is 41.

The square root of 1966739 is about 1402.4047204712. The cubic root of 1966739 is about 125.2897597951.

The spelling of 1966739 in words is "one million, nine hundred sixty-six thousand, seven hundred thirty-nine".