1878381 has 12 divisors (see below), whose sum is σ = 2873052. Its totient is φ = 1178496.

The previous prime is 1878367. The next prime is 1878389. The reversal of 1878381 is 1838781.

It can be written as a sum of positive squares in 2 ways, for example, as 756900 + 1121481 = 870^2 + 1059^2 .

It is not a de Polignac number, because 1878381 - 2¹⁰ = 1877357 is a prime.

It is a super-2 number, since 2×1878381² = 7056630362322, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5986 + ... + 6291.

It is an arithmetic number, because the mean of its divisors is an integer number (239421).

2^1878381 is an apocalyptic number.

It is an amenable number.

1878381 is a deficient number, since it is larger than the sum of its proper divisors (994671).

1878381 is a wasteful number, since it uses less digits than its factorization.

1878381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300 (or 12297 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1878381 is about 1370.5404043661. The cubic root of 1878381 is about 123.3846771048.

The spelling of 1878381 in words is "one million, eight hundred seventy-eight thousand, three hundred eighty-one".