1861238 has 4 divisors (see below), whose sum is σ = 2791860. Its totient is φ = 930618.

The previous prime is 1861219. The next prime is 1861253. The reversal of 1861238 is 8321681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8321681 = 61 ⋅136421.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465308 + ... + 465311.

It is an arithmetic number, because the mean of its divisors is an integer number (697965).

2^1861238 is an apocalyptic number.

1861238 is a deficient number, since it is larger than the sum of its proper divisors (930622).

1861238 is an equidigital number, since it uses as much as digits as its factorization.

1861238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930621.

The product of its digits is 2304, while the sum is 29.

The square root of 1861238 is about 1364.2719670212. The cubic root of 1861238 is about 123.0081736036.

The spelling of 1861238 in words is "one million, eight hundred sixty-one thousand, two hundred thirty-eight".