1818749 has 4 divisors (see below), whose sum is σ = 1829436. Its totient is φ = 1808064.

The previous prime is 1818743. The next prime is 1818769. The reversal of 1818749 is 9478181.

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 648025 + 1170724 = 805^2 + 1082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818749 - 2¹² = 1814653 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818743) 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, 5084 + ... + 5429.

It is an arithmetic number, because the mean of its divisors is an integer number (457359).

2^1818749 is an apocalyptic number.

It is an amenable number.

1818749 is a deficient number, since it is larger than the sum of its proper divisors (10687).

1818749 is a wasteful number, since it uses less digits than its factorization.

1818749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10686.

The product of its digits is 16128, while the sum is 38.

The square root of 1818749 is about 1348.6100251741. The cubic root of 1818749 is about 122.0649345268.

The spelling of 1818749 in words is "one million, eight hundred eighteen thousand, seven hundred forty-nine".