1842440521 has 4 divisors (see below), whose sum is σ = 1842677200. Its totient is φ = 1842203844.

The previous prime is 1842440513. The next prime is 1842440533. The reversal of 1842440521 is 1250442481.

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: 1250442481 = 1163 ⋅1075187.

It is a cyclic number.

It is not a de Polignac number, because 1842440521 - 2³ = 1842440513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1842440581) 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, 106251 + ... + 122368.

It is an arithmetic number, because the mean of its divisors is an integer number (460669300).

Almost surely, 2^1842440521 is an apocalyptic number.

It is an amenable number.

1842440521 is a deficient number, since it is larger than the sum of its proper divisors (236679).

1842440521 is an equidigital number, since it uses as much as digits as its factorization.

1842440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236678.

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 1842440521 is about 42923.6592219256. The cubic root of 1842440521 is about 1225.9266670972.

The spelling of 1842440521 in words is "one billion, eight hundred forty-two million, four hundred forty thousand, five hundred twenty-one".