1868778 has 16 divisors (see below), whose sum is σ = 4152960. Its totient is φ = 622908.

The previous prime is 1868777. The next prime is 1868807. The reversal of 1868778 is 8778681.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1868777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17250 + ... + 17357.

It is an arithmetic number, because the mean of its divisors is an integer number (259560).

2^1868778 is an apocalyptic number.

1868778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1868778 is an abundant number, since it is smaller than the sum of its proper divisors (2284182).

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

1868778 is a wasteful number, since it uses less digits than its factorization.

1868778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34618 (or 34612 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 1868778 is about 1367.0325526483. The cubic root of 1868778 is about 123.1740545943.

Subtracting 1868778 from its reverse (8778681), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1868778 in words is "one million, eight hundred sixty-eight thousand, seven hundred seventy-eight".