1797442921 has 4 divisors (see below), whose sum is σ = 1892045200. Its totient is φ = 1702840644.

The previous prime is 1797442919. The next prime is 1797442973. The reversal of 1797442921 is 1292447971.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1797442921 - 2¹ = 1797442919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797442981) 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, 47301111 + ... + 47301148.

It is an arithmetic number, because the mean of its divisors is an integer number (473011300).

Almost surely, 2^1797442921 is an apocalyptic number.

It is an amenable number.

1797442921 is a deficient number, since it is larger than the sum of its proper divisors (94602279).

1797442921 is an equidigital number, since it uses as much as digits as its factorization.

1797442921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94602278.

The product of its digits is 254016, while the sum is 46.

The square root of 1797442921 is about 42396.2606959623. The cubic root of 1797442921 is about 1215.8641012806.

The spelling of 1797442921 in words is "one billion, seven hundred ninety-seven million, four hundred forty-two thousand, nine hundred twenty-one".