1851842 has 4 divisors (see below), whose sum is σ = 2777766. Its totient is φ = 925920.

The previous prime is 1851841. The next prime is 1851851. The reversal of 1851842 is 2481581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2481581 = 31 ⋅80051.

It can be written as a sum of positive squares in only one way, i.e., 1819801 + 32041 = 1349^2 + 179^2 .

It is not an unprimeable number, because it can be changed into a prime (1851841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 462959 + ... + 462962.

2^1851842 is an apocalyptic number.

1851842 is a deficient number, since it is larger than the sum of its proper divisors (925924).

1851842 is an equidigital number, since it uses as much as digits as its factorization.

1851842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925923.

The product of its digits is 2560, while the sum is 29.

The square root of 1851842 is about 1360.8240150732. The cubic root of 1851842 is about 122.8008321871.

It can be divided in two parts, 18 and 51842, that multiplied together give a square (933156 = 966²).

The spelling of 1851842 in words is "one million, eight hundred fifty-one thousand, eight hundred forty-two".