1922902721 has 4 divisors (see below), whose sum is σ = 1923030192. Its totient is φ = 1922775252.

The previous prime is 1922902711. The next prime is 1922902781. The reversal of 1922902721 is 1272092291.

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 1922902721 - 2²⁶ = 1855793857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1922902711) 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, 37511 + ... + 72476.

It is an arithmetic number, because the mean of its divisors is an integer number (480757548).

Almost surely, 2^1922902721 is an apocalyptic number.

It is an amenable number.

1922902721 is a deficient number, since it is larger than the sum of its proper divisors (127471).

1922902721 is a wasteful number, since it uses less digits than its factorization.

1922902721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127470.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1922902721 is about 43850.9147110981. The cubic root of 1922902721 is about 1243.5190362404.

The spelling of 1922902721 in words is "one billion, nine hundred twenty-two million, nine hundred two thousand, seven hundred twenty-one".