1878361 has 4 divisors (see below), whose sum is σ = 1888000. Its totient is φ = 1868724.

The previous prime is 1878353. The next prime is 1878367. The reversal of 1878361 is 1638781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1638781 = 331 ⋅4951.

It is a cyclic number.

It is not a de Polignac number, because 1878361 - 2³ = 1878353 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1878367) 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 3 ways as a sum of consecutive naturals, for example, 4521 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (472000).

2^1878361 is an apocalyptic number.

It is an amenable number.

1878361 is a deficient number, since it is larger than the sum of its proper divisors (9639).

1878361 is an equidigital number, since it uses as much as digits as its factorization.

1878361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638.

The product of its digits is 8064, while the sum is 34.

The square root of 1878361 is about 1370.5331079547. The cubic root of 1878361 is about 123.3842391919.

The spelling of 1878361 in words is "one million, eight hundred seventy-eight thousand, three hundred sixty-one".