1866497 has 4 divisors (see below), whose sum is σ = 1877460. Its totient is φ = 1855536.

The previous prime is 1866467. The next prime is 1866499. The reversal of 1866497 is 7946681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1324801 + 541696 = 1151^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866497 - 2¹⁶ = 1800961 is a prime.

It is a super-2 number, since 2×1866497² = 6967622102018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866499) 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, 5222 + ... + 5567.

It is an arithmetic number, because the mean of its divisors is an integer number (469365).

2^1866497 is an apocalyptic number.

It is an amenable number.

1866497 is a deficient number, since it is larger than the sum of its proper divisors (10963).

1866497 is a wasteful number, since it uses less digits than its factorization.

1866497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962.

The product of its digits is 72576, while the sum is 41.

The square root of 1866497 is about 1366.1980090748. The cubic root of 1866497 is about 123.1239194422.

The spelling of 1866497 in words is "one million, eight hundred sixty-six thousand, four hundred ninety-seven".