1966993 has 8 divisors (see below), whose sum is σ = 2256512. Its totient is φ = 1679616.

The previous prime is 1966973. The next prime is 1966999. The reversal of 1966993 is 3996691.

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

It is a 8-Lehmer number, since φ(1966993) divides (1966993-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 1966993 - 2¹⁷ = 1835921 is a prime.

It is a super-2 number, since 2×1966993² = 7738122924098, which contains 22 as substring.

It is a Duffinian number.

1966993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1966999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3121 + ... + 3697.

It is an arithmetic number, because the mean of its divisors is an integer number (282064).

2^1966993 is an apocalyptic number.

It is an amenable number.

1966993 is a deficient number, since it is larger than the sum of its proper divisors (289519).

1966993 is an equidigital number, since it uses as much as digits as its factorization.

1966993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071.

The product of its digits is 78732, while the sum is 43.

The square root of 1966993 is about 1402.4952762844. The cubic root of 1966993 is about 125.2951531949.

The spelling of 1966993 in words is "one million, nine hundred sixty-six thousand, nine hundred ninety-three".