1797880821 has 8 divisors (see below), whose sum is σ = 2615099424. Its totient is φ = 1089624720.

The previous prime is 1797880817. The next prime is 1797880831. The reversal of 1797880821 is 1280887971.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1797880821 - 2² = 1797880817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1797880831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27240586 + ... + 27240651.

It is an arithmetic number, because the mean of its divisors is an integer number (326887428).

Almost surely, 2^1797880821 is an apocalyptic number.

1797880821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1797880821 is a deficient number, since it is larger than the sum of its proper divisors (817218603).

1797880821 is a wasteful number, since it uses less digits than its factorization.

1797880821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54481251.

The product of its (nonzero) digits is 451584, while the sum is 51.

The square root of 1797880821 is about 42401.4247520057. The cubic root of 1797880821 is about 1215.9628311025.

The spelling of 1797880821 in words is "one billion, seven hundred ninety-seven million, eight hundred eighty thousand, eight hundred twenty-one".