1866634 has 64 divisors (see below), whose sum is σ = 3981312. Its totient is φ = 633600.

The previous prime is 1866593. The next prime is 1866637. The reversal of 1866634 is 4366681.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 1866634.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60199 + ... + 60229.

It is an arithmetic number, because the mean of its divisors is an integer number (62208).

2^1866634 is an apocalyptic number.

1866634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1866634 is an abundant number, since it is smaller than the sum of its proper divisors (2114678).

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

1866634 is a wasteful number, since it uses less digits than its factorization.

1866634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91.

The product of its digits is 20736, while the sum is 34.

The square root of 1866634 is about 1366.2481472998. The cubic root of 1866634 is about 123.1269317810.

It can be divided in two parts, 1866 and 634, that added together give a square (2500 = 50²).

The spelling of 1866634 in words is "one million, eight hundred sixty-six thousand, six hundred thirty-four".