1868490 has 48 divisors (see below), whose sum is σ = 5235048. Its totient is φ = 459648.

The previous prime is 1868483. The next prime is 1868501. The reversal of 1868490 is 948681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 870489 + 998001 = 933^2 + 999^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372 + ... + 1968.

2^1868490 is an apocalyptic number.

1868490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2617524).

1868490 is an abundant number, since it is smaller than the sum of its proper divisors (3366558).

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

1868490 is a wasteful number, since it uses less digits than its factorization.

1868490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1868490 is about 1366.9272109370. The cubic root of 1868490 is about 123.1677267604.

The spelling of 1868490 in words is "one million, eight hundred sixty-eight thousand, four hundred ninety".