1969926721 has 4 divisors (see below), whose sum is σ = 2251344832. Its totient is φ = 1688508612.

The previous prime is 1969926709. The next prime is 1969926811. The reversal of 1969926721 is 1276299691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1276299691 = 223 ⋅5723317.

It is not a de Polignac number, because 1969926721 - 2¹⁷ = 1969795649 is a prime.

It is a super-2 number, since 2×1969926721² = 7761222572219623682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1969926121) 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, 140709045 + ... + 140709058.

It is an arithmetic number, because the mean of its divisors is an integer number (562836208).

Almost surely, 2^1969926721 is an apocalyptic number.

It is an amenable number.

1969926721 is a deficient number, since it is larger than the sum of its proper divisors (281418111).

1969926721 is an equidigital number, since it uses as much as digits as its factorization.

1969926721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281418110.

The product of its digits is 734832, while the sum is 52.

The square root of 1969926721 is about 44383.8565359073. The cubic root of 1969926721 is about 1253.5741378373.

The spelling of 1969926721 in words is "one billion, nine hundred sixty-nine million, nine hundred twenty-six thousand, seven hundred twenty-one".