1872641 has 4 divisors (see below), whose sum is σ = 1891284. Its totient is φ = 1854000.

The previous prime is 1872631. The next prime is 1872667. The reversal of 1872641 is 1462781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1462781 = 47 ⋅31123.

It can be written as a sum of positive squares in 2 ways, for example, as 1430416 + 442225 = 1196^2 + 665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872641 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 8³ + 7⁷ + 2 + 6 + 4¹⁰ + 1 .

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1872631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170 + ... + 9371.

It is an arithmetic number, because the mean of its divisors is an integer number (472821).

2^1872641 is an apocalyptic number.

It is an amenable number.

1872641 is a deficient number, since it is larger than the sum of its proper divisors (18643).

1872641 is a wasteful number, since it uses less digits than its factorization.

1872641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18642.

The product of its digits is 2688, while the sum is 29.

The square root of 1872641 is about 1368.4447376493. Note that the first 3 decimals coincide. The cubic root of 1872641 is about 123.2588682868.

The spelling of 1872641 in words is "one million, eight hundred seventy-two thousand, six hundred forty-one".