1866097 has 4 divisors (see below), whose sum is σ = 1874340. Its totient is φ = 1857856.

The previous prime is 1866091. The next prime is 1866101. The reversal of 1866097 is 7906681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7906681 = 137 ⋅57713.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 1089936 = 881^2 + 1044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866091) 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, 3772 + ... + 4237.

It is an arithmetic number, because the mean of its divisors is an integer number (468585).

2^1866097 is an apocalyptic number.

It is an amenable number.

1866097 is a deficient number, since it is larger than the sum of its proper divisors (8243).

1866097 is an equidigital number, since it uses as much as digits as its factorization.

1866097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1866097 is about 1366.0516095668. The cubic root of 1866097 is about 123.1151234487.

The spelling of 1866097 in words is "one million, eight hundred sixty-six thousand, ninety-seven".