1023821969 has 4 divisors (see below), whose sum is σ = 1024612644. Its totient is φ = 1023031296.

The previous prime is 1023821941. The next prime is 1023821999. The reversal of 1023821969 is 9691283201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1007110225 + 16711744 = 31735^2 + 4088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023821969 is a prime.

It is a super-2 number, since 2×1023821969² = 2096422848414073922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023821999) 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, 393392 + ... + 395985.

It is an arithmetic number, because the mean of its divisors is an integer number (256153161).

Almost surely, 2^1023821969 is an apocalyptic number.

It is an amenable number.

1023821969 is a deficient number, since it is larger than the sum of its proper divisors (790675).

1023821969 is an equidigital number, since it uses as much as digits as its factorization.

1023821969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790674.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1023821969 is about 31997.2181447075. The cubic root of 1023821969 is about 1007.8784237688.

The spelling of 1023821969 in words is "one billion, twenty-three million, eight hundred twenty-one thousand, nine hundred sixty-nine".