1798866 has 36 divisors (see below), whose sum is σ = 4060602. Its totient is φ = 575424.

The previous prime is 1798861. The next prime is 1798871. The reversal of 1798866 is 6688971.

1798866 = 245² + 246² + ... + 271².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1798861) and next prime (1798871).

It can be written as a sum of positive squares in 3 ways, for example, as 1782225 + 16641 = 1335^2 + 129^2 .

It is not an unprimeable number, because it can be changed into a prime (1798861) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24606 + ... + 24678.

2^1798866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1798866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2030301).

1798866 is an abundant number, since it is smaller than the sum of its proper divisors (2261736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1798866 is a wasteful number, since it uses less digits than its factorization.

1798866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 115 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1798866 is about 1341.2181030690. The cubic root of 1798866 is about 121.6184892967.

It can be divided in two parts, 179 and 8866, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 1798866 in words is "one million, seven hundred ninety-eight thousand, eight hundred sixty-six".