1966537 has 4 divisors (see below), whose sum is σ = 1971216. Its totient is φ = 1961860.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966537 is 7356691.

It is the 573-rd star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7356691 = 29 ⋅253679.

It is a cyclic number.

It is not a de Polignac number, because 1966537 - 2⁷ = 1966409 is a prime.

It is a d-powerful number, because it can be written as 1 + 9³ + 6⁷ + 6⁸ + 5⁵ + 3⁶ + 7⁴ .

It is a Duffinian number.

1966537 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1966496 and 1966505.

It is not an unprimeable number, because it can be changed into a prime (1966507) 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, 1639 + ... + 2572.

It is an arithmetic number, because the mean of its divisors is an integer number (492804).

2^1966537 is an apocalyptic number.

It is an amenable number.

1966537 is a deficient number, since it is larger than the sum of its proper divisors (4679).

1966537 is an equidigital number, since it uses as much as digits as its factorization.

1966537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678.

The product of its digits is 34020, while the sum is 37.

The square root of 1966537 is about 1402.3326994690. The cubic root of 1966537 is about 125.2854702244.

The spelling of 1966537 in words is "one million, nine hundred sixty-six thousand, five hundred thirty-seven".