1816821054 has 24 divisors (see below), whose sum is σ = 3938009400. Its totient is φ = 605366448.

The previous prime is 1816821031. The next prime is 1816821077. The reversal of 1816821054 is 4501286181.

It is an interprime number because it is at equal distance from previous prime (1816821031) and next prime (1816821077).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29884 + ... + 67280.

It is an arithmetic number, because the mean of its divisors is an integer number (164083725).

Almost surely, 2^1816821054 is an apocalyptic number.

1816821054 is an abundant number, since it is smaller than the sum of its proper divisors (2121188346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1816821054 is a wasteful number, since it uses less digits than its factorization.

1816821054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40104 (or 40101 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1816821054 is about 42624.1839100762. The cubic root of 1816821054 is about 1220.2178805524.

The spelling of 1816821054 in words is "one billion, eight hundred sixteen million, eight hundred twenty-one thousand, fifty-four".